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World War I

World War I
From top to bottom, left to right:
Date28 July 191411 November 1918
(4 years, 3 months and 2 weeks)
Peace treaties
Result Allied Powers victory
See Aftermath of World War I
Allied Powers:
 and Empire:
and others ...
Central Powers:
Commanders and leaders
Main Allied leaders: Main Central leaders:
Casualties and losses
  • Military dead:
  • Over 5,525,000
  • Civilian dead:
  • Over 4,000,000
  • Total dead:
  • Over 9,000,000
  • ...further details
  • Military dead:
  • Over 4,386,000
  • Civilian dead:
  • Over 3,700,000
  • Total dead:
  • Over 8,000,000
  • ...further details

World War I[j] or the First World War (28 July 1914 – 11 November 1918) was a global conflict between two coalitions: the Allies (or Entente) and the Central Powers. Fighting took place mainly in Europe and the Middle East, as well as parts of Africa and the Asia-Pacific, and was characterised by trench warfare and the use of artillery, machine guns, and chemical weapons (gas). World War I was one of the deadliest conflicts in history, resulting in an estimated 9 million military dead and 23 million wounded, plus up to 8 million civilian deaths from causes including genocide. The movement of large numbers of troops and civilians was a major factor in spreading the Spanish flu pandemic.

The causes of World War I included the rise of Germany and decline of the Ottoman Empire, which disturbed the balance of power in place in Europe for most of the 19th century, as well as increased economic competition between nations triggered by new waves of industrialisation and imperialism. Growing tensions between the great powers and in the Balkans reached a breaking point on 28 June 1914, when a Bosnian Serb named Gavrilo Princip assassinated Archduke Franz Ferdinand, heir to the Austro-Hungarian throne. Austria-Hungary held Serbia responsible, and declared war on 28 July. Russia mobilised in Serbia's defence, and by 4 August, Germany, Russia, France, and the United Kingdom were drawn into the war, with the Ottomans joining in November of the same year. Germany's strategy in 1914 was to quickly defeat France, then to transfer its forces to the Russian front. However, this failed, and by the end of the year the Western Front consisted of a continuous line of trenches stretching from the English Channel to Switzerland. The Eastern Front was more dynamic, but neither side could gain a decisive advantage, despite costly offensives. As the fighting expanded to more fronts, Italy, Bulgaria, Romania, Greece and others joined in from 1915 onward.

In April 1917, the United States entered the war on the Allied side following Germany's resumption of unrestricted submarine warfare against Atlantic shipping. Later that year, the Bolsheviks seized power in the Russian October Revolution, after which Soviet Russia signed an armistice with the Central Powers in December, followed by a separate peace in March 1918. That month, Germany launched an offensive in the west, which despite initial successes left the German Army exhausted and demoralised. A successful Allied counter-offensive from August 1918 caused a collapse of the German front line. By early November, Bulgaria, the Ottoman Empire and Austria-Hungary had each signed armistices with the Allies, leaving Germany isolated. Facing a revolution at home, Kaiser Wilhelm II abdicated on 9 November, and the war ended with the Armistice of 11 November 1918.

The Paris Peace Conference of 1919–1920 imposed various settlements on the defeated powers, most notably the Treaty of Versailles, by which Germany lost significant territories, was disarmed, and was required to pay large sums of war reparations to the Allies. The dissolution of the Russian, German, Austro-Hungarian, and Ottoman Empires redrew national boundaries and resulted in the creation of new independent states, including Poland, Finland, the Baltic states, Czechoslovakia, and Yugoslavia. The League of Nations was established to maintain world peace, but its failure to manage instability during the interwar period contributed to the outbreak of World War II in 1939.


The first recorded use of the term First World War was in September 1914 by German biologist and philosopher Ernst Haeckel who stated, "There is no doubt that the course and character of the feared 'European War' ... will become the first world war in the full sense of the word."[1] It was later used as a title for his 1920 memoirs by Lt-Col. Charles à Court Repington.[2]

Before World War II, the events of 1914–1918 were generally known as the Great War or simply the World War.[3] In August 1914, the magazine The Independent wrote "This is the Great War. It names itself".[4] In October 1914, the Canadian magazine Maclean's similarly wrote, "Some wars name themselves. This is the Great War."[5] Contemporary Europeans also referred to it as "the war to end war" and it was also described as "the war to end all wars" due to their perception of its unparalleled scale, devastation, and loss of life.[6]


Political and military alliances

Map of Europe focusing on Austria-Hungary and marking the central location of ethnic groups in it including Slovaks, Czechs, Slovenes, Croats, Serbs, Romanians, Ukrainians, Poles.
Rival military coalitions in 1914:[k]

For much of the 19th century, the major European powers maintained a tenuous balance of power, known as the Concert of Europe.[7] After 1848, this was challenged by Britain's withdrawal into so-called splendid isolation, the decline of the Ottoman Empire, New Imperialism, and the rise of Prussia under Otto von Bismarck. The 1866 Austro-Prussian War established Prussian hegemony in German states, while victory in the 1870–1871 Franco-Prussian War allowed Bismarck to consolidate a German Empire under Prussian leadership. Post 1871, the primary aim of French policy was to avenge this defeat,[8] but by the early 1890s, this had switched to the expansion of the French colonial empire.[9]

In 1873, Bismarck negotiated the League of the Three Emperors, which included Austria-Hungary, Russia and Germany. After the 1877–1878 Russo-Turkish War, the League was dissolved due to Austrian concerns over the expansion of Russian influence in the Balkans, an area they considered to be of vital strategic interest. Germany and Austria-Hungary then formed the 1879 Dual Alliance, which became the Triple Alliance when Italy joined in 1882.[10] For Bismarck, the purpose of these agreements was to isolate France by ensuring the three Empires resolve any disputes between themselves; when this was threatened in 1880 by British and French attempts to negotiate directly with Russia, he reformed the League in 1881, which was renewed in 1883 and 1885. After this expired in 1887, Bismarck set up the Reinsurance Treaty, a secret agreement between Germany and Russia to remain neutral if either were attacked by France or Austria-Hungary.[11]

World empires and colonies c. 1914

For Bismarck, peace with Russia was the foundation of German foreign policy but in 1890, he was forced to retire by Wilhelm II. The latter was persuaded not to renew the Reinsurance Treaty by his new Chancellor, Leo von Caprivi.[12] This gave France an opening to agree the Franco-Russian Alliance in 1894, which was then followed by the 1904 Entente Cordiale with Britain. The Triple Entente was completed by the 1907 Anglo-Russian Convention. While not formal alliances, by settling long-standing colonial disputes in Asia and Africa, British support for France or Russia in any future conflict now became a possibility.[13] This was accentuated by British and Russian support for France against Germany during the 1911 Agadir Crisis.[14]

Arms race

SMS Rheinland, a Nassau-class battleship, Germany's first response to the British Dreadnought, 1910

German economic and industrial strength continued to expand rapidly post-1871. Backed by Wilhelm II, Admiral Alfred von Tirpitz sought to use this growth to build an Imperial German Navy, that could compete with the British Royal Navy.[15] This policy was based on the work of by US naval author Alfred Thayer Mahan, who argued that possession of a blue-water navy was vital for global power projection; Tirpitz had his books translated into German, while Wilhelm made them required reading for his advisors and senior military personnel.[16]

However, it was also an emotional decision, driven by Wilhelm's simultaneous admiration for the Royal Navy and desire to surpass it. Bismarck thought that the British would not interfere in Europe, as long as its maritime supremacy remained secure, but his dismissal in 1890 led to a change in policy and an Anglo-German naval arms race began.[17] Despite the vast sums spent by Tirpitz, the launch of HMS Dreadnought in 1906 gave the British a technological advantage over their German rivals.[15] Ultimately, the race diverted huge resources into creating a German navy large enough to antagonise Britain, but not defeat it; in 1911, Chancellor Theobald von Bethmann Hollweg acknowledged defeat, leading to the Rüstungswende or 'armaments turning point', when he switched expenditure from the navy to the army.[18]

This decision was not driven by a reduction in political tensions but by German concern over Russia's quick recovery from its defeat in the Russo-Japanese War and subsequent 1905 Russian Revolution that same year. Economic reforms, backed by French funding, led to a significant post-1908 expansion of railways and transportation infrastructure, particularly in its western border regions.[19] Since Germany and Austria-Hungary relied on faster mobilisation to compensate for their numerical inferiority compared to Russia, the threat posed by the closing of this gap was more important than competing with the Royal Navy. After Germany expanded its standing army by 170,000 troops in 1913, France extended compulsory military service from two to three years; similar measures were taken by the Balkan powers and Italy, which led to increased expenditure by the Ottomans and Austria-Hungary. Absolute figures are difficult to calculate due to differences in categorising expenditure since they often omit civilian infrastructure projects like railways which also had logistical importance and military use. It is known, however, that from 1908 to 1913, military spending by the six major European powers increased by over 50% in real terms.[20]

Conflicts in the Balkans

Photo of large white building with one sign saying "Moritz Schiller" and another in Arabic; in front is a cluster of people looking at a poster on the wall.
Sarajevo citizens reading a poster with the proclamation of the Austrian annexation in 1908

The years before 1914 were marked by a series of crises in the Balkans, as other powers sought to benefit from the Ottoman decline. While Pan-Slavic and Orthodox Russia considered itself the protector of Serbia and other Slav states, they preferred the strategically vital Bosporus straits to be controlled by a weak Ottoman government, rather than an ambitious Slav power like Bulgaria. Russia had ambitions in northeastern Anatolia while its clients had overlapping claims in the Balkans. These competing interests divided Russian policy-makers and added to regional instability.[21]

Austrian statesmen viewed the Balkans as essential for the continued existence of their Empire and saw Serbian expansion as a direct threat. The 1908–1909 Bosnian Crisis began when Austria annexed the former Ottoman territory of Bosnia and Herzegovina, which it had occupied since 1878. Timed to coincide with the Bulgarian Declaration of Independence from the Ottoman Empire, this unilateral action was denounced by the European powers, but accepted as there was no consensus on how to resolve the situation. Some historians see this as a significant escalation, ending any chance of Austria cooperating with Russia in the Balkans, while also damaging diplomatic relations between Serbia and Italy, both of whom had their expansionist ambitions in the region.[22]

Tensions increased after the 1911–1912 Italo-Turkish War demonstrated Ottoman weakness and led to the formation of the Balkan League, an alliance of Serbia, Bulgaria, Montenegro, and Greece.[23] The League quickly overran most of the Ottomans' territory in the Balkans during the 1912–1913 First Balkan War, much to the surprise of outside observers.[24] The Serbian capture of ports on the Adriatic resulted in partial Austrian mobilisation, starting on 21 November 1912, including units along the Russian border in Galicia. In a meeting the next day, the Russian government decided not to mobilise in response, unwilling to precipitate a war for which they were not as of yet prepared to handle.[25]

The Great Powers sought to re-assert control through the 1913 Treaty of London, which had created an independent Albania while enlarging the territories of Bulgaria, Serbia, Montenegro and Greece. However, disputes between the victors sparked the 33-day Second Balkan War, when Bulgaria attacked Serbia and Greece on 16 June 1913; it was defeated, losing most of Macedonia to Serbia and Greece, and Southern Dobruja to Romania.[26] The result was that even countries which benefited from the Balkan Wars, such as Serbia and Greece, felt cheated of their "rightful gains", while for Austria it demonstrated the apparent indifference with which other powers viewed their concerns, including Germany.[27] This complex mix of resentment, nationalism and insecurity helps explain why the pre-1914 Balkans became known as the "powder keg of Europe".[28][29][30][31]


Sarajevo assassination

Traditionally thought to show the arrest of Gavrilo Princip (right), this photo is now believed by historians to depict an innocent bystander, Ferdinand Behr on 28 June 1914.[32][33]

In the summer of 1914, the sovereigns of Europe were woven together by treaties, alliances, as well as secret agreements. The Triple Alliance (1882) encompassed the German Empire, Austria, and Italy.[34]

On 28 June 1914, Archduke Franz Ferdinand of Austria, heir presumptive to Emperor Franz Joseph I of Austria, visited Sarajevo, the capital of the recently annexed Bosnia and Herzegovina. Cvjetko Popović, Gavrilo Princip, Nedeljko Čabrinović, Trifko Grabež, and Vaso Čubrilović (Bosnian Serbs) and Muhamed Mehmedbašić (from the Bosniaks community),[35] from the movement known as Young Bosnia, took up positions along the route taken by the Archduke's motorcade, to assassinate him. Supplied with arms by extremists within the Serbian Black Hand intelligence organisation, they hoped his death would free Bosnia from Austrian rule, although there was little agreement on what would replace it.[36]

Nedeljko Čabrinović threw a grenade at the Archduke's car and injured two of his aides, who were taken to hospital while the convoy carried on. The other assassins were also unsuccessful but, an hour later, as Ferdinand was returning from visiting the injured officers, his car took a wrong turn into a street where Gavrilo Princip was standing. He fired two pistol shots, fatally wounding Ferdinand and his wife Sophie.[37] Although Emperor Franz Joseph was shocked by the incident, political and personal differences meant the two men were not close; allegedly, his first reported comment was "A higher power has re-established the order which I, alas, could not preserve".[38]

According to historian Zbyněk Zeman, in Vienna "the event almost failed to make any impression whatsoever. On 28 and 29 June, the crowds listened to music and drank wine, as if nothing had happened."[39] Nevertheless, the impact of the murder of the heir to the throne was significant, and has been described by historian Christopher Clark as a "9/11 effect, a terrorist event charged with historic meaning, transforming the political chemistry in Vienna".[40]

Expansion of violence in Bosnia and Herzegovina

Crowds on the streets in the aftermath of the anti-Serb riots in Sarajevo, 29 June 1914

Austro-Hungarian authorities encouraged subsequent anti-Serb riots in Sarajevo, in which Bosnian Croats and Bosniaks killed two Bosnian Serbs and damaged numerous Serb-owned buildings.[41][42] Violent actions against ethnic Serbs were also organised outside Sarajevo, in other cities in Austro-Hungarian-controlled Bosnia and Herzegovina, Croatia and Slovenia. Austro-Hungarian authorities in Bosnia and Herzegovina imprisoned and extradited approximately 5,500 prominent Serbs, 700 to 2,200 of whom died in prison. A further 460 Serbs were sentenced to death. A predominantly Bosniak special militia known as the Schutzkorps was established, and carried out the persecution of Serbs.[43][44][45][46]

July Crisis

Cheering crowds in London and Paris on the day war was declared.

The assassination initiated the July Crisis, a month of diplomatic manoeuvring between Austria-Hungary, Germany, Russia, France and Britain. Believing that Serbian intelligence helped organise Franz Ferdinand's murder, Austrian officials wanted to use the opportunity to end their interference in Bosnia and saw war as the best way of achieving this.[47] However, the Foreign Ministry had no solid proof of Serbian involvement and a dossier used to make its case contained multiple errors.[48] On 23 July, Austria delivered an ultimatum to Serbia, listing ten demands made intentionally unacceptable to provide an excuse for starting hostilities.[49]

Ethno-linguistic map of Austria-Hungary, 1910. Bosnia-Herzegovina was annexed in 1908.

Serbia ordered general mobilization on 25 July, but accepted all the terms, except for those empowering Austrian representatives to suppress "subversive elements" inside Serbia, and take part in the investigation and trial of Serbians linked to the assassination.[50][51] Claiming this amounted to rejection, Austria broke off diplomatic relations and ordered partial mobilisation the next day; on 28 July, they declared war on Serbia and began shelling Belgrade. Having initiated war preparations on 25 July, Russia now ordered general mobilization in support of Serbia on 30th.[52]

Anxious to ensure backing from the SPD political opposition by presenting Russia as the aggressor, German Chancellor Bethmann Hollweg delayed the commencement of war preparations until 31 July.[53] That afternoon, the Russian government were handed a note requiring them to "cease all war measures against Germany and Austria-Hungary" within 12 hours.[54] A further German demand for neutrality was refused by the French who ordered general mobilization but delayed declaring war.[55] The German General Staff had long assumed they faced a war on two fronts; the Schlieffen Plan envisaged using 80% of the army to defeat France, then switch to Russia. Since this required them to move quickly, mobilization orders were issued that afternoon.[56]

At a meeting on 29 July, the British cabinet had narrowly decided its obligations to Belgium under the 1839 Treaty of London did not require it to oppose a German invasion with military force. However, this was largely driven by Prime Minister Asquith's desire to maintain unity; he and his senior Cabinet ministers were already committed to supporting France, the Royal Navy had been mobilised, and public opinion was strongly in favour of intervention.[57] On 31 July, Britain sent notes to Germany and France, asking them to respect Belgian neutrality; France pledged to do so, but Germany did not reply.[58]

Once the German ultimatum to Russia expired on the morning of 1 August, the two countries were at war. Later the same day, Wilhelm was informed by his ambassador in London, Prince Lichnowsky, that Britain would remain neutral if France was not attacked, and might not intervene at all given the ongoing Home Rule Crisis in Ireland.[59] Jubilant at this news, he ordered General Moltke, the German chief of staff, to "march the whole of the ... army to the East". This allegedly brought Moltke to the verge of a nervous breakdown, before Lichnowsky realized he was mistaken. Once Wilhelm received a telegram from George V, it confirmed there had been a misunderstanding, and he told Moltke, "Now do what you want."[60]

Aware of German plans to attack through Belgium, French Commander-in-Chief Joseph Joffre asked his government for permission to cross the border and pre-empt such a move. To avoid violating Belgian neutrality, he was told any advance could come only after a German invasion.[61] Instead, the French cabinet ordered its Army to withdraw 10 km behind the German frontier, to avoid any incident which might provoke the war. On 2 August, Germany occupied Luxembourg and exchanged fire with French units when German patrols entered French territory; on 3 August, they declared war on France and demanded free passage across Belgium, which was refused. Early on the morning of 4 August, the Germans invaded, and Albert I of Belgium called for assistance under the Treaty of London.[62][63] Britain sent Germany an ultimatum demanding they withdraw from Belgium; when this expired at midnight, without a response, the two empires were at war.[64]

Progress of the war

Opening hostilities

Confusion among the Central Powers

The strategy of the Central Powers suffered from miscommunication. Germany promised to support Austria-Hungary's invasion of Serbia, but interpretations of what this meant differed. Previously tested deployment plans had been replaced early in 1914, but those had never been tested in exercises. Austro-Hungarian leaders believed Germany would cover its northern flank against Russia.[65]

Serbian campaign

Serbian Army Blériot XI "Oluj", 1915

Beginning on 12 August, the Austrians and Serbs clashed at the battles of the Cer and Kolubara; over the next two weeks, Austrian attacks were repulsed with heavy losses, dashing their hopes of a swift victory and marking the first major Allied victories of the war. As a result, Austria had to keep sizeable forces on the Serbian front, weakening their efforts against Russia.[66] Serbia's victory against Austria-Hungary in the 1914 invasion has been called one of the major upset victories of the twentieth century.[67] In spring 1915, the campaign saw the first use of anti-aircraft warfare after an Austrian plane was shot down with ground-to-air fire, as well as the first medical evacuation by the Serbian army in autumn 1915.[68][69]

German offensive in Belgium and France

German soldiers on the way to the front in 1914; at this stage, all sides expected the conflict to be a short one.

Upon mobilisation, 80% of the German Army was located on the Western Front, with the remainder acting as a screening force in the East; officially titled Aufmarsch II West, it is better known as the Schlieffen Plan after its creator, Alfred von Schlieffen, head of the German General Staff from 1891 to 1906. Rather than a direct attack across their shared frontier, the German right wing would sweep through the Netherlands and Belgium, then swing south, encircling Paris and trapping the French army against the Swiss border. Schlieffen estimated that this would take six weeks, after which the German army would transfer to the East and defeat the Russians.[70]

The plan was substantially modified by his successor, Helmuth von Moltke the Younger. Under Schlieffen, 85% of German forces in the west were assigned to the right wing, with the remainder holding along the frontier. By keeping his left-wing deliberately weak, he hoped to lure the French into an offensive into the "lost provinces" of Alsace-Lorraine, which was the strategy envisaged by their Plan XVII.[70] However, Moltke grew concerned that the French might push too hard on his left flank and as the German Army increased in size from 1908 to 1914, he changed the allocation of forces between the two wings from 85:15 to 70:30.[71] He also considered Dutch neutrality essential for German trade and cancelled the incursion into the Netherlands, which meant any delays in Belgium threatened the viability of the plan.[72] Historian Richard Holmes argues that these changes meant the right wing was not strong enough to achieve decisive success and thus led to unrealistic goals and timings.[73]

French bayonet charge during the Battle of the Frontiers; by the end of August, French casualties exceeded 260,000, including 75,000 dead.

The initial German advance in the West was very successful and by the end of August, the Allied left, which included the British Expeditionary Force (BEF), was in full retreat. At the same time, the French offensive in Alsace-Lorraine was a disastrous failure, with casualties exceeding 260,000, including 27,000 killed on 22 August during the Battle of the Frontiers.[74] German planning provided broad strategic instructions while allowing army commanders considerable freedom in carrying them out at the front; this worked well in 1866 and 1870 but in 1914, von Kluck used this freedom to disobey orders, opening a gap between the German armies as they closed on Paris.[75] The French army, reinforced by the British expeditionary corps, seized this opportunity to counter-attack and pushed the German army 40 to 80 km back. Both armies were then so exhausted that no decisive move could be implemented, so they settled in trenches, with the vain hope of breaking through as soon as they could build local superiority.

In 1911, the Russian Stavka agreed with the French to attack Germany within fifteen days of mobilisation, ten days before the Germans had anticipated, although it meant the two Russian armies that entered East Prussia on 17 August did so without many of their support elements.[76]

By the end of 1914, German troops held strong defensive positions inside France, controlled the bulk of France's domestic coalfields, and inflicted 230,000 more casualties than it lost itself. However, communications problems, combined with questionable command decisions, cost Germany the chance of a decisive outcome, while it had failed to achieve the primary objective of avoiding a long, two-front war.[77] As was apparent to several German leaders, this amounted to a strategic defeat; shortly after the First Battle of the Marne, Crown Prince Wilhelm told an American reporter "We have lost the war. It will go on for a long time but lost it is already."[78]

Asia and the Pacific

Japanese soldiers occupy an abandoned German trench during the Siege of Tsingtao, 1914

On 30 August 1914, New Zealand occupied German Samoa, now the independent state of Samoa. On 11 September, the Australian Naval and Military Expeditionary Force landed on the island of New Britain, then part of German New Guinea. On 28 October, the German cruiser SMS Emden sank the Russian cruiser Zhemchug in the Battle of Penang. Japan declared war on Germany before seizing territories in the Pacific, which later became the South Seas Mandate, as well as German Treaty ports on the Chinese Shandong peninsula at Tsingtao. After Vienna refused to withdraw its cruiser SMS Kaiserin Elisabeth from Tsingtao, Japan declared war on Austria-Hungary as well, and the ship was sunk at Tsingtao in November 1914.[79] Within a few months, Allied forces had seized all German territories in the Pacific, leaving only isolated commerce raiders and a few holdouts in New Guinea.[80][81]

African campaigns

Some of the first clashes of the war involved British, French, and German colonial forces in Africa. On 6–7 August, French and British troops invaded the German protectorates of Togoland and Kamerun. On 10 August, German forces in South-West Africa attacked South Africa; sporadic and fierce fighting continued for the rest of the war. The German colonial forces in German East Africa, led by Colonel Paul von Lettow-Vorbeck, fought a guerrilla warfare campaign during World War I and only surrendered two weeks after the armistice took effect in Europe.[82]

Indian support for the Allies

British Indian Army infantry divisions in France; these troops were withdrawn in December 1915, and served in the Mesopotamian campaign.

Before the war, Germany had attempted to use Indian nationalism and pan-Islamism to its advantage, a policy continued post-1914 by instigating uprisings in India, while the Niedermayer–Hentig Expedition urged Afghanistan to join the war on the side of Central Powers. However, contrary to British fears of a revolt in India, the outbreak of the war saw a reduction in nationalist activity.[83][84] This was largely because leaders from the Indian National Congress and other groups believed support for the British war effort would hasten Indian Home Rule, a promise allegedly made explicit in 1917 by Edwin Montagu, the Secretary of State for India.[85]

In 1914, the British Indian Army was larger than the British Army itself, and between 1914 and 1918 an estimated 1.3 million Indian soldiers and labourers served in Europe, Africa, and the Middle East, while the Government of India and their princely allies supplied large quantities of food, money, and ammunition. In all, 140,000 soldiers served on the Western Front and nearly 700,000 in the Middle East, with 47,746 killed and 65,126 wounded.[86]

The suffering engendered by the war, as well as the failure of the British government to grant self-government to India after the end of hostilities, bred disillusionment, resulting in the campaign for full independence led by Mahatma Gandhi.[87]

Western Front 1914 to 1916

Trench warfare begins

British Indian soldiers digging trenches in Laventie, France, 1915

Pre-war military tactics that had emphasised open warfare and the individual rifleman proved obsolete when confronted with conditions prevailing in 1914. Technological advances allowed the creation of strong defensive systems largely impervious to massed infantry advances, such as barbed wire, machine guns and above all far more powerful artillery, which dominated the battlefield and made crossing open ground extremely difficult.[88] Both sides struggled to develop tactics for breaching entrenched positions without suffering heavy casualties. In time, however, technology enabled the production of new offensive weapons, such as gas warfare and the tank.[89]

After the First Battle of the Marne in September 1914, Allied and German forces unsuccessfully tried to outflank each other, a series of manoeuvres later known as the "Race to the Sea". By the end of 1914, the opposing forces confronted each other along an uninterrupted line of entrenched positions from the Channel to the Swiss border.[90] Since the Germans were normally able to choose where to stand, they generally held the high ground, while their trenches tended to be better built; those constructed by the French and English were initially considered "temporary", only needed until an offensive would destroy the German defences.[91] Both sides tried to break the stalemate using scientific and technological advances. On 22 April 1915, at the Second Battle of Ypres, the Germans (violating the Hague Convention) used chlorine gas for the first time on the Western Front. Several types of gas soon became widely used by both sides and though it never proved a decisive, battle-winning weapon, it became one of the most feared and best-remembered horrors of the war.[92][93]

Continuation of trench warfare

German casualties at the Somme, 1916

In February 1916, the Germans attacked French defensive positions at the Battle of Verdun, lasting until December 1916. The Germans made initial gains before French counter-attacks returned matters to near their starting point. Casualties were greater for the French, but the Germans bled heavily as well, with anywhere from 700,000[94] to 975,000[95] casualties suffered between the two combatants. Verdun became a symbol of French determination and self-sacrifice.[96]

The Battle of the Somme was an Anglo-French offensive from July to November 1916. The opening day on 1 July 1916 was the bloodiest single day in the history of the British Army, which suffered 57,500 casualties, including 19,200 dead. As a whole, the Somme offensive led to an estimated 420,000 British casualties, along with 200,000 French and 500,000 Germans.[97] Gunfire was not the only cause of death; the diseases that emerged in the trenches were a major killer on both sides. The living conditions led to disease and infection, such as trench foot, lice, typhus, trench fever, and the 'Spanish flu'.[98]

Naval war

Battleships of the Hochseeflotte, 1917

At the start of the war, German cruisers were scattered across the globe, some of which were subsequently used to attack Allied merchant shipping. These were systematically hunted down by the Royal Navy, though not before causing considerable damage. One of the most successful was the SMS Emden, part of the German East Asia Squadron stationed at Qingdao, which seized or sank 15 merchantmen, as well as a Russian cruiser and a French destroyer. Most of the squadron was returning to Germany when it sank two British armoured cruisers at the Battle of Coronel in November 1914, before being virtually destroyed at the Battle of the Falkland Islands in December. The SMS Dresden escaped with a few auxiliaries, but after the Battle of Más a Tierra, these too were either destroyed or interned.[99]

Soon after the outbreak of hostilities, Britain began a naval blockade of Germany. This proved effective in cutting off vital military and civilian supplies, though it violated accepted international law.[100] Britain also mined international waters which closed off entire sections of the ocean, even to neutral ships.[101] Since there was limited response to this tactic of the British, Germany expected a similar response to its unrestricted submarine warfare.[102]

The Battle of Jutland [l] in May/June 1916 was the only full-scale clash of battleships during the war, and one of the largest in history. The clash was indecisive, though the Germans inflicted more damage than they received, since thereafter the bulk of the German High Seas Fleet was confined to port.[103]

U-155 exhibited near Tower Bridge in London, after the 1918 Armistice

German U-boats attempted to cut the supply lines between North America and Britain.[104] The nature of submarine warfare meant that attacks often came without warning, giving the crews of the merchant ships little hope of survival.[104][105] The United States launched a protest, and Germany changed its rules of engagement. After the sinking of the passenger ship RMS Lusitania in 1915, Germany promised not to target passenger liners, while Britain armed its merchant ships, placing them beyond the protection of the "cruiser rules", which demanded warning and movement of crews to "a place of safety" (a standard that lifeboats did not meet).[106] Finally, in early 1917, Germany adopted a policy of unrestricted submarine warfare, realising the Americans would eventually enter the war.[104][107] Germany sought to strangle Allied sea lanes before the United States could transport a large army overseas, but, after initial successes, eventually failed to do so.[104]

The U-boat threat lessened in 1917, when merchant ships began travelling in convoys, escorted by destroyers. This tactic made it difficult for U-boats to find targets, which significantly lessened losses; after the hydrophone and depth charges were introduced, destroyers could potentially successfully attack a submerged submarine. Convoys slowed the flow of supplies since ships had to wait as convoys were assembled; the solution was an extensive program of building new freighters. Troopships were too fast for the submarines and did not travel the North Atlantic in convoys.[108] The U-boats sunk more than 5,000 Allied ships, at the cost of 199 submarines.[109]

World War I also saw the first use of aircraft carriers in combat, with HMS Furious launching Sopwith Camels in a successful raid against the Zeppelin hangars at Tondern in July 1918, as well as blimps for antisubmarine patrol.[110]

Southern theatres

War in the Balkans

Refugee transport from Serbia in Leibnitz, Styria, 1914

Faced with Russia in the east, Austria-Hungary could spare only one-third of its army to attack Serbia. After suffering heavy losses, the Austrians briefly occupied the Serbian capital, Belgrade. A Serbian counter-attack in the Battle of Kolubara succeeded in driving them from the country by the end of 1914. For the first 10 months of 1915, Austria-Hungary used most of its military reserves to fight Italy. German and Austro-Hungarian diplomats, however, scored a coup by persuading Bulgaria to join the attack on Serbia.[111] The Austro-Hungarian provinces of Slovenia, Croatia and Bosnia provided troops for Austria-Hungary in the fight with Serbia, Russia and Italy. Montenegro allied itself with Serbia.[112]

Bulgarian soldiers in a trench, preparing to fire against an incoming aeroplane

Bulgaria declared war on Serbia on 14 October 1915 and joined in the attack by the Austro-Hungarian army under Mackensen's army of 250,000 that was already underway. Serbia was conquered in a little more than a month, as the Central Powers, now including Bulgaria, sent in 600,000 troops in total. The Serbian army, fighting on two fronts and facing certain defeat, retreated into northern Albania. The Serbs suffered defeat in the Battle of Kosovo. Montenegro covered the Serbian retreat toward the Adriatic coast in the Battle of Mojkovac on 6–7 January 1916, but ultimately the Austrians also conquered Montenegro. The surviving Serbian soldiers were then evacuated to Greece.[113] After the conquest, Serbia was divided between Austro-Hungary and Bulgaria.[114]

In late 1915, a Franco-British force landed at Salonica in Greece to offer assistance and to pressure its government to declare war against the Central Powers. However, the pro-German King Constantine I dismissed the pro-Allied government of Eleftherios Venizelos before the Allied expeditionary force arrived.[115]

The Macedonian front was at first mostly static. French and Serbian forces retook limited areas of Macedonia by recapturing Bitola on 19 November 1916 following the costly Monastir offensive, which brought stabilisation of the front.[116]

Austro-Hungarian troops executing captured Serbians, 1917. Serbia lost about 850,000 people during the war, a quarter of its pre-war population.[117]

Serbian and French troops finally made a breakthrough in September 1918 in the Vardar offensive, after most German and Austro-Hungarian troops had been withdrawn. The Bulgarians were defeated at the Battle of Dobro Pole, and by 25 September British and French troops had crossed the border into Bulgaria proper as the Bulgarian army collapsed. Bulgaria capitulated four days later, on 29 September 1918.[118] The German high command responded by despatching troops to hold the line, but these forces were too weak to re-establish a front.[119]

The disappearance of the Macedonian front meant that the road to Budapest and Vienna was now opened to Allied forces. Hindenburg and Ludendorff concluded that the strategic and operational balance had now shifted decidedly against the Central Powers and, a day after the Bulgarian collapse, insisted on an immediate peace settlement.[120]

Ottoman Empire

Australian troops charging near a Turkish trench during the Gallipoli campaign

The Ottomans threatened Russia's Caucasian territories and Britain's communications with India via the Suez Canal. As the conflict progressed, the Ottoman Empire took advantage of the European powers' preoccupation with the war and conducted large-scale ethnic cleansing of the indigenous Armenian, Greek, and Assyrian Christian populations, known as the Armenian genocide, Greek genocide, and Sayfo respectively.[121][122][123]

The British and French opened overseas fronts with the Gallipoli (1915) and Mesopotamian campaigns (1914). In Gallipoli, the Ottoman Empire successfully repelled the British, French, and Australian and New Zealand Army Corps (ANZACs). In Mesopotamia, by contrast, after the defeat of the British defenders in the siege of Kut by the Ottomans (1915–16), British Imperial forces reorganised and captured Baghdad in March 1917. The British were aided in Mesopotamia by local Arab and Assyrian fighters, while the Ottomans employed local Kurdish and Turcoman tribes.[124]

Further to the west, the Suez Canal was defended from Ottoman attacks in 1915 and 1916; in August 1916, a German and Ottoman force was defeated at the Battle of Romani by the ANZAC Mounted Division and the 52nd (Lowland) Infantry Division. Following this victory, an Egyptian Expeditionary Force advanced across the Sinai Peninsula, pushing Ottoman forces back in the Battle of Magdhaba in December and the Battle of Rafa on the border between the Egyptian Sinai and Ottoman Palestine in January 1917.[125]

Russian forest trench at the Battle of Sarikamish, 1914–1915

Russian armies generally had success in the Caucasus campaign. Enver Pasha, supreme commander of the Ottoman armed forces, was ambitious and dreamed of re-conquering central Asia and areas that had been previously lost to Russia. He was, however, a poor commander.[126] He launched an offensive against the Russians in the Caucasus in December 1914 with 100,000 troops, insisting on a frontal attack against mountainous Russian positions in winter. He lost 86% of his force at the Battle of Sarikamish.[127]

Kaiser Wilhelm II and Prince Leopold of Bavaria inspecting Turkish troops of the 15th Corps in East Galicia, Austria-Hungary (now Poland).

The Ottoman Empire, with German support, invaded Persia (modern Iran) in December 1914 to cut off British and Russian access to petroleum reservoirs around Baku near the Caspian Sea.[128] Persia, ostensibly neutral, had long been under the spheres of British and Russian influence. The Ottomans and Germans were aided by Kurdish and Azeri forces, together with a large number of major Iranian tribes, such as the Qashqai, Tangistanis, Lurs, and Khamseh, while the Russians and British had the support of Armenian and Assyrian forces. The Persian campaign was to last until 1918 and end in failure for the Ottomans and their allies. However, the Russian withdrawal from the war in 1917 led Armenian and Assyrian forces, who had hitherto inflicted a series of defeats upon the forces of the Ottomans and their allies, to be cut off from supply lines, outnumbered, outgunned and isolated, forcing them to fight and flee towards British lines in northern Mesopotamia.[129]

General Yudenich, the Russian commander from 1915 to 1916, drove the Turks out of most of the southern Caucasus with a string of victories.[127]

The Arab Revolt, instigated by the Arab bureau of the British Foreign Office, started in June 1916 with the Battle of Mecca, led by Sharif Hussein of Mecca. The Sharif declared the independence of the Kingdom of Hejaz and, with British assistance, conquered much of Ottoman-held Arabia, resulting finally in the Ottoman surrender of Damascus. Fakhri Pasha, the Ottoman commander of Medina, resisted for more than 2+12 years during the siege of Medina before surrendering in January 1919.[130]

The Senussi tribe, along the border of Italian Libya and British Egypt, incited and armed by the Turks, waged a small-scale guerrilla war against Allied troops. The British were forced to dispatch 12,000 troops to oppose them in the Senussi campaign. Their rebellion was finally crushed in mid-1916.[131]

Total Allied casualties on the Ottoman fronts amounted to 650,000 men. Total Ottoman casualties were 725,000, with 325,000 dead and 400,000 wounded.[132]

Italian Front

Isonzo Offensives 1915–1917

Though Italy joined the Triple Alliance in 1882, a treaty with its traditional Austrian enemy was so controversial that subsequent governments denied its existence and the terms were only made public in 1915.[133] This arose from nationalist designs on Austro-Hungarian territory in Trentino, the Austrian Littoral, Rijeka and Dalmatia, which were considered vital to secure the borders established in 1866.[134] In 1902, Rome secretly had agreed with France to remain neutral if the latter was attacked by Germany, effectively nullifying its role in the Triple Alliance.[135]

When the war began in 1914, Italy argued the Triple Alliance was defensive and it was not obliged to support an Austrian attack on Serbia. Opposition to joining the Central Powers increased when Turkey became a member in September, since in 1911 Italy had occupied Ottoman possessions in Libya and the Dodecanese islands.[136] To secure Italian neutrality, the Central Powers offered them Tunisia, while in return for an immediate entry into the war, the Allies agreed to their demands for Austrian territory and sovereignty over the Dodecanese.[137] Although they remained secret, these provisions were incorporated into the April 1915 Treaty of London; Italy joined the Triple Entente and, on 23 May, declared war on Austria-Hungary,[138] followed by Germany fifteen months later.

Austro-Hungarian trench at 3,850 metres in the Ortler Alps, one of the most challenging fronts of the war

The pre-1914 Italian army was short of officers, trained men, adequate transport and modern weapons; by April 1915, some of these deficiencies had been remedied but it was still unprepared for the major offensive required by the Treaty of London.[139] The advantage of superior numbers was offset by the difficult terrain; much of the fighting took place high in the Alps and Dolomites, where trench lines had to be cut through rock and ice and keeping troops supplied was a major challenge. These issues were exacerbated by unimaginative strategies and tactics.[140] Between 1915 and 1917, the Italian commander, Luigi Cadorna, undertook a series of frontal assaults along the Isonzo, which made little progress and cost many lives; by the end of the war, Italian combat deaths totalled around 548,000.[141]

In the spring of 1916, the Austro-Hungarians counterattacked in Asiago in the Strafexpedition, but made little progress and were pushed by the Italians back to Tyrol.[142] Although an Italian corps occupied southern Albania in May 1916, their main focus was the Isonzo front which, after the capture of Gorizia in August 1916, remained static until October 1917. After a combined Austro-German force won a major victory at Caporetto, Cadorna was replaced by Armando Diaz who retreated more than 100 kilometres (62 mi) before holding positions along the Piave River.[143] A second Austrian offensive was repulsed in June 1918 and by October it was clear the Central Powers had lost the war. On 24 October, Diaz launched the Battle of Vittorio Veneto and initially met stubborn resistance,[144] but with Austria-Hungary collapsing, Hungarian divisions in Italy demanded they be sent home.[145] When this was granted, many others followed and the Imperial army disintegrated, the Italians taking over 300,000 prisoners.[146] On 3 November, the Armistice of Villa Giusti ended hostilities between Austria-Hungary and Italy which occupied Trieste and areas along the Adriatic Sea awarded to it in 1915.[147]

Eastern Front

Initial actions

Emperor Nicholas II and Grand Duke Nikolaevich following the Russian capture of Przemyśl, the longest siege of the war.

As previously agreed with France, Russian plans at the start of the war were to simultaneously advance into Austrian Galicia and East Prussia as soon as possible. Although their attack on Galicia was largely successful, and the invasions achieved their aim of forcing Germany to divert troops from the Western Front, the speed of mobilisation meant they did so without much of their heavy equipment and support functions. These weaknesses contributed to Russian defeats at Tannenberg and the Masurian Lakes in August and September 1914, forcing them to withdraw from East Prussia with heavy losses.[148][149] By spring 1915, they had also retreated from Galicia, and the May 1915 Gorlice–Tarnów offensive allowed the Central Powers to invade Russian-occupied Poland.[150]

Despite the successful June 1916 Brusilov offensive against the Austrians in eastern Galicia,[151] shortages of supplies, heavy losses and command failures prevented the Russians from fully exploiting their victory. However, it was one of the most significant offensives of the war, diverting German resources from Verdun, relieving Austro-Hungarian pressure on the Italians, and convincing Romania to enter the war on the side of the Allies on 27 August. It also fatally weakened both the Austrian and Russian armies, whose offensive capabilities were badly affected by their losses and increased disillusion with the war that ultimately led to the Russian revolutions.[152]

Meanwhile, unrest grew in Russia as the Tsar remained at the front, with the home front controlled by Empress Alexandra. Her increasingly incompetent rule and food shortages in urban areas led to widespread protests and the murder of her favourite, Grigori Rasputin, at the end of 1916.[153]

Romanian participation

World War I is located in Romania
Timișoara (Banat)
Timișoara (Banat)
Cluj (Transylvania)
Cluj (Transylvania)
Chișinău (Moldova)
Chișinău (Moldova)
Constanța (Dobruja)
Constanța (Dobruja)
Romania key locations 1916–1918 (note; using 2022 borders)

Despite secretly agreeing to support the Triple Alliance in 1883, Romania increasingly found itself at odds with the Central Powers over their support for Bulgaria in the Balkan Wars and the status of ethnic Romanian communities in Hungarian-controlled Transylvania,[154] which comprised an estimated 2.8 million of the 5.0 million population.[155] With the ruling elite split into pro-German and pro-Entente factions, Romania remained neutral in 1914, arguing like Italy that because Austria-Hungary had declared war on Serbia, it was under no obligation to join them.[156] They maintained this position for the next two years while allowing Germany and Austria to transport military supplies and advisors across Romanian territory.[157]

In September 1914, Russia acknowledged Romanian rights to Austro-Hungarian territories including Transylvania and Banat, whose acquisition had widespread popular support,[155] and Russian success against Austria led Romania to join the Entente in the August 1916 Treaty of Bucharest.[157] Under the strategic plan known as Hypothesis Z, the Romanian army planned an offensive into Transylvania, while defending Southern Dobruja and Giurgiu against a possible Bulgarian counterattack.[158] On 27 August 1916, they attacked Transylvania and occupied substantial parts of the province before being driven back by the recently formed German 9th Army, led by former Chief of Staff Erich von Falkenhayn.[159] A combined German-Bulgarian-Turkish offensive captured Dobruja and Giurgiu, although the bulk of the Romanian army managed to escape encirclement and retreated to Bucharest, which surrendered to the Central Powers on 6 December 1916.[160]

In the summer of 1917, a Central Powers offensive began in Romania under the command of August von Mackensen to knock Romania out of the war, resulting in the battles of Oituz, Mărăști and Mărășești where up to 1,000,000 Central Powers troops were present. The battles lasted from 22 July to 3 September and eventually, the Romanian army was victorious advancing 500 km2. August von Mackensen could not plan for another offensive as he had to transfer troops to the Italian Front.[161] Following the Russian revolution, Romania found itself alone on the Eastern Front and signed the Treaty of Bucharest with the Central Powers, which recognised Romanian sovereignty over Bessarabia in return for ceding control of passes in the Carpathian Mountains to Austria-Hungary and leasing its oil wells to Germany for 99 years. Although approved by Parliament, King Ferdinand I refused to sign it, hoping for an Allied victory in the west.[162] Romania re-entered the war on 10 November 1918 on the side of the Allies and the Treaty of Bucharest was formally annulled by the Armistice of 11 November 1918.[163][m]

Central Powers peace overtures

On 12 December 1916, after ten brutal months of the Battle of Verdun and a successful offensive against Romania, Germany attempted to negotiate a peace with the Allies.[165] However, this attempt was rejected out of hand as a "duplicitous war ruse".[165]

"They shall not pass", a phrase typically associated with the defence of Verdun

US president Woodrow Wilson attempted to intervene as a peacemaker, asking for both sides to state their demands and start negotiations. Lloyd George's War Cabinet considered the German offer to be a ploy to create divisions among the Allies. After initial outrage and much deliberation, they took Wilson's note as a separate effort, signalling that the United States was on the verge of entering the war against Germany following the "submarine outrages". While the Allies debated a response to Wilson's offer, the Germans chose to rebuff it in favour of "a direct exchange of views". Learning of the German response, the Allied governments were free to make clear demands in their response of 14 January. They sought restoration of damages, the evacuation of occupied territories, reparations for France, Russia and Romania, and a recognition of the principle of nationalities.[166] This included the liberation of Italians, Slavs, Romanians, Czecho-Slovaks, and the creation of a "free and united Poland".[166] The Allies sought guarantees that would prevent or limit future wars, complete with sanctions, as a condition of any peace settlement.[167] The negotiations failed and the Entente powers rejected the German offer on the grounds of honour, and noted Germany had not put forward any specific proposals.[165]

Final years of the war

Russian Revolution and withdrawal

By the end of 1916, Russian casualties totalled nearly five million killed, wounded or captured, with major urban areas affected by food shortages and high prices. In March 1917, Tsar Nicholas ordered the military to forcibly suppress a wave of strikes in Petrograd but the troops refused to fire on the crowds. [168] Revolutionaries set up the Petrograd Soviet and fearing a left-wing takeover, the State Duma forced Nicholas to abdicate and established the Russian Provisional Government, which confirmed Russia's willingness to continue the war. However, the Petrograd Soviet refused to disband, creating competing power centres and causing confusion and chaos, with frontline soldiers becoming increasingly demoralised and unwilling to fight on.[169]

Following the Tsar's abdication, Vladimir Lenin—with the help of the German government—was ushered from Switzerland into Russia on 16 April 1917. Discontent and the weaknesses of the Provisional Government led to a rise in the popularity of the Bolshevik Party, led by Lenin, which demanded an immediate end to the war. The Revolution of November was followed in December by an armistice and negotiations with Germany. At first, the Bolsheviks refused the German terms, but when German troops began marching across Ukraine unopposed, the new government acceded to the Treaty of Brest-Litovsk on 3 March 1918. The treaty ceded vast territories, including Finland, Estonia, Latvia, Lithuania, and parts of Poland and Ukraine to the Central Powers.[170]

With the Russian Empire out of the war, Romania found itself alone on the Eastern Front and signed the Treaty of Bucharest with the Central Powers in May 1918, ending the state of war between Romania and the Central Powers. Under the terms of the treaty, Romania had to give territory to Austria-Hungary and Bulgaria and lease its oil reserves to Germany. However, the terms also included the Central Powers' recognition of the union of Bessarabia with Romania.[171][172]

United States enters the war

President Wilson asking Congress to declare war on Germany, 2 April 1917

The United States was a major supplier of war material to the Allies but remained neutral in 1914, in large part due to domestic opposition.[173] The most significant factor in creating the support Wilson needed was the German submarine offensive, which not only cost American lives but paralysed trade as ships were reluctant to put to sea.[174]

On 6 April 1917, Congress declared war on Germany as an "Associated Power" of the Allies.[175] The United States Navy sent a battleship group to Scapa Flow to join the Grand Fleet, and provided convoy escorts. In April 1917, the United States Army had fewer than 300,000 men, including National Guard units, compared to British and French armies of 4.1 and 8.3 million respectively. The Selective Service Act of 1917 drafted 2.8 million men, though training and equipping such numbers was a huge logistical challenge. By June 1918, over 667,000 members of the American Expeditionary Forces (AEF) were transported to France, a figure which reached 2 million by the end of November.[176]

Despite his conviction that Germany must be defeated, Wilson went to war to ensure the US played a leading role in shaping the peace, which meant preserving the AEF as a separate military force, rather than being absorbed into British or French units as his Allies wanted.[177] He was strongly supported by AEF commander General John J. Pershing, a proponent of pre-1914 "open warfare" who considered the French and British emphasis on artillery as misguided and incompatible with American "offensive spirit".[178] Much to the frustration of his Allies, who had suffered heavy losses in 1917, he insisted on retaining control of American troops, and refused to commit them to the front line until able to operate as independent units. As a result, the first significant US involvement was the Meuse–Argonne offensive in late September 1918.[179]

Nivelle Offensive (April–May 1917)

Files of soldiers with rifles slung follow close behind a tank, there is a dead body in the foreground
Canadian Corps troops at the Battle of Vimy Ridge, 1917

In December 1916, Robert Nivelle replaced Pétain as commander of French armies on the Western Front and began planning a spring attack in Champagne, part of a joint Franco-British operation. Nivelle claimed the capture of his main objective, the Chemin des Dames, would achieve a massive breakthrough and cost no more than 15,000 casualties.[180] Poor security meant German intelligence was well informed on tactics and timetables, but despite this, when the attack began on 16 April the French made substantial gains, before being brought to a halt by the newly built and extremely strong defences of the Hindenburg Line. Nivelle persisted with frontal assaults and, by 25 April, the French had suffered nearly 135,000 casualties, including 30,000 dead, most incurred in the first two days.[181]

Concurrent British attacks at Arras were more successful, though ultimately of little strategic value.[182] Operating as a separate unit for the first time, the Canadian Corps capture of Vimy Ridge is viewed by many Canadians as a defining moment in creating a sense of national identity.[183][184] Though Nivelle continued the offensive, on 3 May the 21st Division, which had been involved in some of the heaviest fighting at Verdun, refused orders to go into battle, initiating the French Army mutinies; within days, "collective indiscipline" had spread to 54 divisions, while over 20,000 deserted.[185] Unrest was almost entirely confined to the infantry, whose demands were largely non-political, including better economic support for families at home, and regular periods of leave, which Nivelle had ended.[186]

Sinai and Palestine campaign (1917–1918)

British artillery battery on Mount Scopus in the Battle of Jerusalem, 1917.

In March and April 1917, at the First and Second Battles of Gaza, German and Ottoman forces stopped the advance of the Egyptian Expeditionary Force, which had begun in August 1916 at the Battle of Romani.[187][188] At the end of October 1917, the Sinai and Palestine campaign resumed, when General Edmund Allenby's XXth Corps, XXI Corps and Desert Mounted Corps won the Battle of Beersheba.[189] Two Ottoman armies were defeated a few weeks later at the Battle of Mughar Ridge and, early in December, Jerusalem had been captured following another Ottoman defeat at the Battle of Jerusalem.[190][191][192] About this time, Friedrich Freiherr Kress von Kressenstein was relieved of his duties as the Eighth Army's commander, replaced by Djevad Pasha, and a few months later the commander of the Ottoman Army in Palestine, Erich von Falkenhayn, was replaced by Otto Liman von Sanders.[193][194]

In early 1918, the front line was extended and the Jordan Valley was occupied, following the First Transjordan and the Second Transjordan attacks by British Empire forces in March and April 1918.[195]

German offensive and Allied counter-offensive (March–November 1918)

Between April and November 1918, the Allies increased their front-line rifle strength while German strength fell by half.[196]

In December 1917, the Central Powers signed an armistice with Russia, thus freeing large numbers of German troops for use in the West. With German reinforcements and new American troops pouring in, the outcome was to be decided on the Western Front. The Central Powers knew that they could not win a protracted war, but they held high hopes for success in a final quick offensive.[197] Ludendorff drew up plans (codenamed Operation Michael) for the 1918 offensive on the Western Front. The operation commenced on 21 March 1918, with an attack on British forces near Saint-Quentin. German forces achieved an unprecedented advance of 60 kilometres (37 mi).[198] The initial offensive was a success; after heavy fighting, however, the offensive was halted. Lacking tanks or motorised artillery, the Germans were unable to consolidate their gains. The problems of re-supply were also exacerbated by increasing distances that now stretched over terrain that was shell-torn and often impassable to traffic.[199]

Following this, Germany launched Operation Georgette against the northern English Channel ports. The Allies halted the drive after limited territorial gains by Germany. The German Army to the south then conducted Operations Blücher and Yorck, pushing broadly towards Paris. Germany launched Operation Marne (Second Battle of the Marne) on 15 July, in an attempt to encircle Reims. The resulting counter-attack, which started the Hundred Days Offensive on 8 August,[200] led to a marked collapse in German morale.[201][202][203]

Allied advance to the Hindenburg Line

American soldiers firing on German entrenched positions during the Meuse-Argonne offensive, 1918

By September, the Germans had fallen back to the Hindenburg Line. The Allies had advanced to the Hindenburg Line in the north and centre. German forces launched numerous counterattacks, but positions and outposts of the Line continued falling, with the BEF alone taking 30,441 prisoners in the last week of September. On 24 September, the Supreme Army Command informed the leaders in Berlin that armistice talks were inevitable.[204]

The final assault on the Hindenburg Line began with the Meuse-Argonne offensive, launched by American and French troops on 26 September. Two days later the Allied armies (Belgian, French and British) attacked around Ypres, and the day after the British Fourth and French First Army at St Quentin in the centre of the line. The following week, cooperating American and French units broke through in Champagne at the Battle of Blanc Mont Ridge (3–27 October), forcing the Germans off the commanding heights, and closing towards the Belgian frontier.[205] On 8 October, the Hindenburg Line was pierced by British and Dominion troops of the First and Third British Armies at the Second Battle of Cambrai.[206]

Breakthrough of Macedonian Front (September 1918)

Bulgarian major Ivanov with white flag surrendering to Serbian 7th Danube regiment near Kumanovo

Allied forces started the Vardar offensive on 15 September at two key points: Dobro Pole and near Dojran Lake. In the Battle of Dobro Pole, the Serbian and French armies had success after a three-day-long battle with relatively small casualties, and subsequently made a breakthrough in the front, something which was rarely seen in World War I. After the front was broken, Allied forces started to liberate Serbia and reached Skopje at 29 September, after which Bulgaria signed an armistice with the Allies on 30 September.[207][208]

Armistices and capitulations

Italian troops reach Trento during the Battle of Vittorio Veneto, 1918

The collapse of the Central Powers came swiftly. Bulgaria was the first to sign an armistice, the Armistice of Salonica on 29 September 1918.[209] German Emperor Wilhelm II in a telegram to Bulgarian Tsar Ferdinand I described the situation thus: "Disgraceful! 62,000 Serbs decided the war!".[210][211] On the same day, the German Supreme Army Command informed Kaiser Wilhelm II and the Imperial Chancellor Count Georg von Hertling, that the military situation facing Germany was hopeless.[212]

On 24 October, the Italians began a push that rapidly recovered territory lost after the Battle of Caporetto. This culminated in the Battle of Vittorio Veneto, marking the end of the Austro-Hungarian Army as an effective fighting force. The offensive also triggered the disintegration of the Austro-Hungarian Empire. During the last week of October, declarations of independence were made in Budapest, Prague, and Zagreb. On 29 October, the imperial authorities asked Italy for an armistice, but the Italians continued advancing, reaching Trento, Udine, and Trieste. On 3 November, Austria-Hungary sent a flag of truce to ask for an armistice (Armistice of Villa Giusti). The terms, arranged with the Allied Authorities in Paris, were communicated to the Austrian commander and accepted. The Armistice with Austria was signed in the Villa Giusti, near Padua, on 3 November. Austria and Hungary signed separate armistices following the overthrow of the Habsburg monarchy. In the following days, the Italian Army occupied Innsbruck and all Tyrol, with over 20,000 soldiers.[213]

On 30 October, the Ottoman Empire capitulated, and signed the Armistice of Mudros.[209]

German government surrenders

Ferdinand Foch (second from right) pictured outside the carriage in Compiègne after agreeing to the armistice that ended the war there.[214]

With the military faltering and with widespread loss of confidence in the Kaiser leading to his abdication and fleeing of the country, Germany moved towards surrender. Prince Maximilian of Baden took charge of a new government on October 3 as Chancellor of Germany to negotiate with the Allies. Negotiations with President Wilson began immediately, in the hope that he would offer better terms than the British and French. Wilson demanded a constitutional monarchy and parliamentary control over the German military.[215]

In northern Germany, the German Revolution of 1918–1919 began at the end of October 1918. Units of the German Navy refused to set sail for a last, large-scale operation in a war they believed to be as good as lost, initiating the uprising. The sailors' revolt, which then ensued in the naval ports of Wilhelmshaven and Kiel, spread across the whole country within days and led to the proclamation of a republic on 9 November 1918, shortly thereafter to the abdication of Kaiser Wilhelm II, and German surrender.[216][217][218][219][220]


In the aftermath of the war, four empires disappeared: the German, Austro-Hungarian, Ottoman, and Russian.[n] Numerous nations regained their former independence, and new ones were created. Four dynasties fell as a result of the war: the Romanovs, the Hohenzollerns, the Habsburgs, and the Ottomans. Belgium and Serbia were badly damaged, as was France, with 1.4 million soldiers dead,[221] not counting other casualties. Germany and Russia were similarly affected.[222]

Formal end of the war

The signing of the Treaty of Versailles in the Hall of Mirrors, Versailles, 28 June 1919, by Sir William Orpen

A formal state of war between the two sides persisted for another seven months, until the signing of the Treaty of Versailles with Germany on 28 June 1919. The United States Senate did not ratify the treaty despite public support for it,[223][224] and did not formally end its involvement in the war until the Knox–Porter Resolution was signed on 2 July 1921 by President Warren G. Harding.[225] For the British Empire, the state of war ceased under the provisions of the Termination of the Present War (Definition) Act 1918 concerning:

  • Germany on 10 January 1920.[226]
  • Austria on 16 July 1920.[227]
  • Bulgaria on 9 August 1920.[228]
  • Hungary on 26 July 1921.[229]
  • Turkey on 6 August 1924.[230]
Greek prime minister Eleftherios Venizelos signing the Treaty of Sèvres

Some war memorials date the end of the war as being when the Versailles Treaty was signed in 1919, which was when many of the troops serving abroad finally returned home; by contrast, most commemorations of the war's end concentrate on the armistice of 11 November 1918.[231]

Peace treaties and national boundaries

Map of territorial changes in Europe after World War I (as of 1923)

After the war, there grew a certain amount of academic focus on the causes of war and on the elements that could make peace flourish. In part, these led to the institutionalization of peace and conflict studies, security studies and International Relations (IR) in general.[232] The Paris Peace Conference imposed a series of peace treaties on the Central Powers officially ending the war. The 1919 Treaty of Versailles dealt with Germany and, building on Wilson's 14th point, established the League of Nations on 28 June 1919.[233][234]

The Central Powers had to acknowledge responsibility for "all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by" their aggression. In the Treaty of Versailles, this statement was Article 231. This article became known as the "War Guilt Clause", as the majority of Germans felt humiliated and resentful.[235] Overall, the Germans felt they had been unjustly dealt with by what they called the "diktat of Versailles". German historian Hagen Schulze said the Treaty placed Germany "under legal sanctions, deprived of military power, economically ruined, and politically humiliated."[236] Belgian historian Laurence Van Ypersele emphasises the central role played by memory of the war and the Versailles Treaty in German politics in the 1920s and 1930s:

Active denial of war guilt in Germany and German resentment at both reparations and continued Allied occupation of the Rhineland made widespread revision of the meaning and memory of the war problematic. The legend of the "stab in the back" and the wish to revise the "Versailles diktat", and the belief in an international threat aimed at the elimination of the German nation persisted at the heart of German politics. Even a man of peace such as [Gustav] Stresemann publicly rejected German guilt. As for the Nazis, they waved the banners of domestic treason and international conspiracy in an attempt to galvanise the German nation into a spirit of revenge. Like a Fascist Italy, Nazi Germany sought to redirect the memory of the war to the benefit of its policies.[237]

Meanwhile, new nations liberated from German rule viewed the treaty as a recognition of wrongs committed against small nations by much larger aggressive neighbours.[238]

Dissolution of Austria-Hungary after war

Austria-Hungary was partitioned into several successor states, largely but not entirely along ethnic lines. Apart from Austria and Hungary, Czechoslovakia, Italy, Poland, Romania and Yugoslavia received territories from the Dual Monarchy (the formerly separate and autonomous Kingdom of Croatia-Slavonia was incorporated into Yugoslavia). The details were contained in the treaties of Saint-Germain-en-Laye and Trianon. As a result, Hungary lost 64% of its total population, decreasing from 20.9 million to 7.6 million, and losing 31% (3.3 out of 10.7 million) of its ethnic Hungarians.[239] According to the 1910 census, speakers of the Hungarian language included approximately 54% of the entire population of the Kingdom of Hungary. Within the country, numerous ethnic minorities were present: 16.1% Romanians, 10.5% Slovaks, 10.4% Germans, 2.5% Ruthenians, 2.5% Serbs and 8% others.[240] Between 1920 and 1924, 354,000 Hungarians fled former Hungarian territories attached to Romania, Czechoslovakia, and Yugoslavia.[241]

The Russian Empire, which withdrew from the war in 1917 after the October Revolution, lost much of its western frontier as the newly independent nations of Estonia, Finland, Latvia, Lithuania, and Poland were carved from it. Romania took control of Bessarabia in April 1918.[242]

National identities

After 123 years, Poland re-emerged as an independent country. The Kingdom of Serbia and its dynasty, as a "minor Entente nation" and the country with the most casualties per capita,[243][244][245] became the backbone of a new multinational state, the Kingdom of Serbs, Croats and Slovenes, later renamed Yugoslavia. Czechoslovakia, combining the Kingdom of Bohemia with parts of the Kingdom of Hungary, became a new nation. Romania would unite all Romanian-speaking people under a single state, leading to Greater Romania.[246]

In Australia and New Zealand, the Battle of Gallipoli became known as those nations' "Baptism of Fire". It was the first major war in which the newly established countries fought, and it was one of the first times that Australian troops fought as Australians, not just subjects of the British Crown, and independent national identities for these nations took hold. Anzac Day, commemorating the Australian and New Zealand Army Corps (ANZAC), celebrates this defining moment.[247][248]

In the aftermath of World War I, Greece fought against Turkish nationalists led by Mustafa Kemal, a war that eventually resulted in a massive population exchange between the two countries under the Treaty of Lausanne.[249] According to various sources,[250] several hundred thousand Greeks died during this period, which was tied in with the Greek genocide.[251]


Men transporting wounded Ottoman at Sirkeci

Of the 60 million European military personnel who were mobilised from 1914 to 1918, an estimated 8 million were killed, 7 million were permanently disabled, and 15 million were seriously injured. Germany lost 15.1% of its active male population, Austria-Hungary lost 17.1%, and France lost 10.5%.[252] France mobilised 7.8 million men, of which 1.4 million died and 3.2 million were injured.[253] Approximately 15,000 deployed men sustained gruesome injuries to the face, causing social stigma and marginalisation; they were called the gueules cassées. In Germany, civilian deaths were 474,000 higher than in peacetime, due in large part to food shortages and malnutrition that had weakened disease resistance. These excess deaths are estimated as 271,000 in 1918, plus another 71,000 in the first half of 1919 when the blockade was still in effect.[254] Starvation caused by famine killed approximately 100,000 people in Lebanon.[255]

Emergency military hospital during the Spanish flu pandemic in Camp Funston, Kansas, 1918

Diseases flourished in the chaotic wartime conditions. In 1914 alone, louse-borne epidemic typhus killed 200,000 in Serbia.[256] Starting in early 1918, a major influenza epidemic known as Spanish flu spread across the world, accelerated by the movement of large numbers of soldiers, often crammed together in camps and transport ships with poor sanitation. The Spanish flu killed at least 17 to 25 million people,[257][258] including an estimated 2.64 million Europeans and as many as 675,000 Americans.[259] Between 1915 and 1926, an epidemic of encephalitis lethargica spread across the world affecting nearly five million people.[260][261]

8 million equines mostly horses, donkeys and mules died, three-quarters of them from the extreme conditions they worked in.[262]

War crimes

Chemical weapons in warfare

French soldiers making a gas and flame attack on German trenches in Flanders

The German army was the first to successfully deploy chemical weapons during the Second Battle of Ypres (22 April – 25 May 1915), after German scientists working under the direction of Fritz Haber at the Kaiser Wilhelm Institute developed a method to weaponize chlorine.[o][264] The use of chemical weapons had been sanctioned by the German High Command to force Allied soldiers out of their entrenched positions, complementing rather than supplanting more lethal conventional weapons.[264] At the time, chemical weapons were deployed by all major belligerents throughout the war, inflicting approximately 1.3 million casualties, of which about 90,000 were fatal.[264] For example, there were an estimated 186,000 causalites from British chemical weapons during the war (80% of which were the result of exposure to the vesicant 'mustard gas', introduced to the battlefield by the Germans in July 1917),[264] and up to one-third of American casualties were caused by them. The Russian Army reportedly suffered roughly 500,000 chemical weapon casualties in World War I.[265] The use of chemical weapons in warfare was a direct violation of the 1899 Hague Declaration Concerning Asphyxiating Gases and the 1907 Hague Convention on Land Warfare, which prohibited their use.[266][267]

Genocides by the Ottoman Empire

Armenians killed during the Armenian genocide. Image taken from Ambassador Morgenthau's Story, written by Henry Morgenthau Sr. and published in 1918.[268]

The ethnic cleansing of the Ottoman Empire's Armenian population, including mass deportations and executions, during the final years of the Ottoman Empire is considered genocide.[269] The Ottomans carried out organised and systematic massacres of the Armenian population at the beginning of the war and manipulated acts of Armenian resistance by portraying them as rebellions to justify further extermination.[270] In early 1915, several Armenians volunteered to join the Russian forces and the Ottoman government used this as a pretext to issue the Tehcir Law (Law on Deportation), which authorised the deportation of Armenians from the Empire's eastern provinces to Syria between 1915 and 1918. The Armenians were intentionally marched to death and a number were attacked by Ottoman brigands.[271] While the exact number of deaths is unknown, the International Association of Genocide Scholars estimates around 1.5 million.[269][272] The government of Turkey continues to deny the genocide to the present day, arguing that those who died were victims of inter-ethnic fighting, famine, or disease during World War I; these claims are rejected by most historians.[273]

Other ethnic groups were similarly attacked by the Ottoman Empire during this period, including Assyrians and Greeks, and some scholars consider those events to be part of the same policy of extermination.[274][275][276] At least 250,000 Assyrian Christians, about half of the population, and 350,000–750,000 Anatolian and Pontic Greeks were killed between 1915 and 1922.[277]

Prisoners of war

British prisoners guarded by Ottoman forces after the First Battle of Gaza in 1917

About 8 million soldiers surrendered and were held in POW camps during the war. All nations pledged to follow the Hague Conventions on fair treatment of prisoners of war, and the survival rate for POWs was generally much higher than that of combatants at the front.[278]

Around 25–31% of Russian losses (as a proportion of those captured, wounded, or killed) were to prisoner status; for Austria-Hungary 32%; for Italy 26%; for France 12%; for Germany 9%; for Britain 7%. Prisoners from the Allied armies totalled about 1.4 million (not including Russia, which lost 2.5–3.5 million soldiers as prisoners). From the Central Powers, about 3.3 million soldiers became prisoners; most of them surrendered to Russians.[279]

Soldiers' experiences

Allied personnel was around 42,928,000, while Central personnel was near 25,248,000.[222][280] British soldiers of the war were initially volunteers but were increasingly conscripted. Surviving veterans returning home, often found they could discuss their experiences only among themselves. Grouping, they formed "veterans' associations" or "Legions". A small number of personal accounts of American veterans have been collected by the Library of Congress Veterans History Project.[281]


U.S. Army recruiting poster with Uncle Sam, 1917

Conscription was common in most European countries. However, it was controversial in English-speaking countries.[282] It was especially unpopular among minority ethnicities—especially the Irish Catholics in Ireland,[283] Australia,[284][285] and the French Catholics in Canada.[286][287]

In the United States, conscription began in 1917 and was generally well-received, with a few pockets of opposition in isolated rural areas.[288] The administration decided to rely primarily on conscription, rather than voluntary enlistment, to raise military manpower after only 73,000 volunteers enlisted out of the initial 1 million target in the first six weeks of war.[289]

Military attachés and war correspondents

Military and civilian observers from every major power closely followed the course of the war.[290] Many were able to report on events from a perspective somewhat akin to modern "embedded" positions within the opposing land and naval forces.[291][292]

Economic effects

Macro- and micro-economic consequences devolved from the war. Families were altered by the departure of many men. With the death or absence of the primary wage earner, women were forced into the workforce in unprecedented numbers. At the same time, the industry needed to replace the lost labourers sent to war. This aided the struggle for voting rights for women.[293]

Poster showing women workers, 1915

In all nations, the government's share of GDP increased, surpassing 50% in both Germany and France and nearly reaching that level in Britain. To pay for purchases in the United States, Britain cashed in its extensive investments in American railroads and then began borrowing heavily from Wall Street. President Wilson was on the verge of cutting off the loans in late 1916 but allowed a great increase in US government lending to the Allies. After 1919, the US demanded repayment of these loans. The repayments were, in part, funded by German reparations that, in turn, were supported by American loans to Germany. This circular system collapsed in 1931 and some loans were never repaid. Britain still owed the United States $4.4 billion[p] of World War I debt in 1934; the last installment was finally paid in 2015.[294]

Britain turned to her colonies for help in obtaining essential war materials whose supply from traditional sources had become difficult. Geologists such as Albert Kitson were called on to find new resources of precious minerals in the African colonies. Kitson discovered important new deposits of manganese, used in munitions production, in the Gold Coast.[295]

Article 231 of the Treaty of Versailles (the so-called "war guilt" clause) stated Germany accepted responsibility for "all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies."[296] It was worded as such to lay a legal basis for reparations, and a similar clause was inserted in the treaties with Austria and Hungary. However, neither of them interpreted it as an admission of war guilt.[297] In 1921, the total reparation sum was placed at 132 billion gold marks. However, "Allied experts knew that Germany could not pay" this sum. The total sum was divided into three categories, with the third being "deliberately designed to be chimerical" and its "primary function was to mislead public opinion ... into believing the 'total sum was being maintained.'"[298] Thus, 50 billion gold marks (12.5 billion dollars) "represented the actual Allied assessment of German capacity to pay" and "therefore … represented the total German reparations" figure that had to be paid.[298]

This figure could be paid in cash or in-kind (coal, timber, chemical dyes, etc.). In addition, some of the territory lost—via the Treaty of Versailles—was credited towards the reparation figure as were other acts such as helping to restore the Library of Louvain.[299] By 1929, the Great Depression arrived, causing political chaos throughout the world.[300] In 1932 the payment of reparations was suspended by the international community, by which point Germany had paid only the equivalent of 20.598 billion gold marks in reparations.[301] With the rise of Adolf Hitler, all bonds and loans that had been issued and taken out during the 1920s and early 1930s were cancelled. David Andelman notes "Refusing to pay doesn't make an agreement null and void. The bonds, the agreement, still exist." Thus, following the Second World War, at the London Conference in 1953, Germany agreed to resume payment on the money borrowed. On 3 October 2010, Germany made the final payment on these bonds.[q]

The Australian prime minister, Billy Hughes, wrote to the British prime minister, David Lloyd George, "You have assured us that you cannot get better terms. I much regret it, and hope even now that some way may be found of securing agreement for demanding reparation commensurate with the tremendous sacrifices made by the British Empire and her Allies." Australia received £5,571,720 in war reparations, but the direct cost of the war to Australia had been £376,993,052, and, by the mid-1930s, repatriation pensions, war gratuities, interest and sinking fund charges were £831,280,947.[306] Of about 416,000 Australians who served, about 60,000 were killed and another 152,000 were wounded.[222]

The war contributed to the evolution of the wristwatch from women's jewellery to a practical everyday item, replacing the pocketwatch, which requires a free hand to operate.[307] Trench watches were designed for use by the military as pocket watches were not as effective for combat. Military funding of advancements in radio contributed to the postwar popularity of the medium.[307]

Support and opposition for the war


Poster urging women to join the British war effort, published by the Young Women's Christian Association, 1915

In the Balkans, Yugoslav nationalists such as the leader, Ante Trumbić, strongly supported the war, desiring the freedom of Yugoslavs from Austria-Hungary and other foreign powers and the creation of an independent Yugoslavia. The Yugoslav Committee, led by Trumbić, was formed in Paris on 30 April 1915 but shortly moved its office to London.[308] In April 1918, the Rome Congress of Oppressed Nationalities met, including Czechoslovak, Italian, Polish, Transylvanian, and Yugoslav representatives who urged the Allies to support national self-determination for the peoples residing within Austria-Hungary.[309]

In the Middle East, Arab nationalism soared in Ottoman territories in response to the rise of Turkish nationalism during the war, with Arab nationalist leaders advocating the creation of a pan-Arab state. In 1916, the Arab Revolt began in Ottoman-controlled territories of the Middle East to achieve independence.[310]

In East Africa, Iyasu V of Ethiopia was supporting the Dervish state who were at war with the British in the Somaliland campaign.[311] Von Syburg, the German envoy in Addis Ababa, said, "now the time has come for Ethiopia to regain the coast of the Red Sea driving the Italians home, to restore the Empire to its ancient size." The Ethiopian Empire was on the verge of entering World War I on the side of the Central Powers before Iyasu's overthrow at the Battle of Segale due to Allied pressure on the Ethiopian aristocracy.[312] Iyasu was accused of converting to Islam.[313] According to Ethiopian historian Bahru Zewde, the evidence used to prove Iyasu's conversion was a doctored photo of Iyasu wearing a turban provided by the Allies.[314] Some historians claim the British spy T. E. Lawrence forged the photo.[315]

Bermuda Volunteer Rifle Corps First Contingent in Bermuda, winter 1914–1915, before joining 1 Lincolnshire Regiment in France in June 1915. The dozen remaining after Guedecourt on 25 September 1916, merged with a Second Contingent. The two contingents suffered 75% casualties.

Several socialist parties initially supported the war when it began in August 1914.[309] But European socialists split on national lines, with the concept of class conflict held by radical socialists such as Marxists and syndicalists being overborne by their patriotic support for the war.[316] Once the war began, Austrian, British, French, German, and Russian socialists followed the rising nationalist current by supporting their countries' intervention in the war.[317]

Italian nationalism was stirred by the outbreak of the war and was initially strongly supported by a variety of political factions. One of the most prominent and popular Italian nationalist supporters of the war was Gabriele D'Annunzio, who promoted Italian irredentism and helped sway the Italian public to support intervention in the war.[318] The Italian Liberal Party, under the leadership of Paolo Boselli, promoted intervention in the war on the side of the Allies and used the Dante Alighieri Society to promote Italian nationalism.[319] Italian socialists were divided on whether to support the war or oppose it; some were militant supporters of the war, including Benito Mussolini and Leonida Bissolati.[320] However, the Italian Socialist Party decided to oppose the war after anti-militarist protestors were killed, resulting in a general strike called Red Week.[321] The Italian Socialist Party purged itself of pro-war nationalist members, including Mussolini.[321] Mussolini, a syndicalist who supported the war on grounds of irredentist claims on Italian-populated regions of Austria-Hungary, formed the pro-interventionist Il Popolo d'Italia and the Fasci Rivoluzionario d'Azione Internazionalista ("Revolutionary Fasci for International Action") in October 1914 that later developed into the Fasci Italiani di Combattimento in 1919, the origin of fascism.[322] Mussolini's nationalism enabled him to raise funds from Ansaldo (an armaments firm) and other companies to create Il Popolo d'Italia to convince socialists and revolutionaries to support the war.[323]

Patriotic funds

On both sides, there was large-scale fundraising for soldiers' welfare, their dependents and those injured. The Nail Men were a German example. Around the British Empire, there were many patriotic funds, including the Royal Patriotic Fund Corporation, Canadian Patriotic Fund, Queensland Patriotic Fund and, by 1919, there were 983 funds in New Zealand.[324] At the start of the next world war the New Zealand funds were reformed, having been criticised as overlapping, wasteful and abused,[325] but 11 were still functioning in 2002.[326]


Many countries jailed those who spoke out against the conflict. These included Eugene Debs in the United States and Bertrand Russell in Britain. In the US, the Espionage Act of 1917 and Sedition Act of 1918 made it a federal crime to oppose military recruitment or make any statements deemed "disloyal". Publications at all critical of the government were removed from circulation by postal censors,[327] and many served long prison sentences for statements of fact deemed unpatriotic.

Sackville Street (now O'Connell Street) after the 1916 Easter Rising in Dublin

Several nationalists opposed intervention, particularly within states that the nationalists were hostile to. Although the vast majority of Irish people consented to participate in the war in 1914 and 1915, a minority of advanced Irish nationalists had staunchly opposed taking part.[328] The war began amid the Home Rule crisis in Ireland that had resurfaced in 1912, and by July 1914 there was a serious possibility of an outbreak of civil war in Ireland. Irish nationalists and Marxists attempted to pursue Irish independence, culminating in the Easter Rising of 1916, with Germany sending 20,000 rifles to Ireland to stir unrest in Britain.[329] The British government placed Ireland under martial law in response to the Easter Rising, though once the immediate threat of revolution had dissipated, the authorities did try to make concessions to nationalist feeling.[330] However, opposition to involvement in the war increased in Ireland, resulting in the Conscription Crisis of 1918.

Other opposition came from conscientious objectors—some socialist, some religious—who had refused to fight. In Britain, 16,000 people asked for conscientious objector status.[331] Some of them, most notably prominent peace activist Stephen Hobhouse, refused both military and alternative service.[332] Many suffered years of prison, including solitary confinement and bread and water diets. Even after the war, in Britain, many job advertisements were marked "No conscientious objectors need to apply".[333]

On 1–4 May 1917, about 100,000 workers and soldiers of Petrograd, and after them, the workers and soldiers of other Russian cities, led by the Bolsheviks, demonstrated under banners reading "Down with the war!" and "all power to the Soviets!". The mass demonstrations resulted in a crisis for the Russian Provisional Government.[334] In Milan, in May 1917, Bolshevik revolutionaries organised and engaged in rioting calling for an end to the war, and managed to close down factories and stop public transportation.[335] The Italian army was forced to enter Milan with tanks and machine guns to face Bolsheviks and anarchists, who fought violently until May 23 when the army gained control of the city. Almost 50 people (including three Italian soldiers) were killed and over 800 people were arrested.[335]


Royal Air Force Sopwith Camel. In April 1917, the average life expectancy of a British pilot on the Western Front was 93 flying hours.[336]

World War I began as a clash of 20th-century technology and 19th-century tactics, with the inevitably large ensuing casualties. By the end of 1917, however, the major armies, now numbering millions of men, had modernised and were making use of telephone, wireless communication,[337] armoured cars, tanks (especially with the advent of the prototype tank, Little Willie), and aircraft.[338]

Captain Marcel Courmes, pilot of the French 2nd Bombardment, Group GB 2, in August 1915

Artillery also underwent a revolution. In 1914, cannons were positioned in the front line and fired directly at their targets. By 1917, indirect fire with guns (as well as mortars and even machine guns) was commonplace, using new techniques for spotting and ranging, notably, aircraft and the often overlooked field telephone.[339]

Fixed-wing aircraft were initially used for reconnaissance and ground attack. To shoot down enemy planes, anti-aircraft guns and fighter aircraft were developed. Strategic bombers were created, principally by the Germans and British, though the former used Zeppelins as well.[340] Towards the end of the conflict, aircraft carriers were used for the first time, with HMS Furious launching Sopwith Camels in a raid to destroy the Zeppelin hangars at Tønder in 1918.[341]


1917 political cartoon about the Zimmermann Telegram

The non-military diplomatic and propaganda interactions among the nations were designed to build support for the cause or to undermine support for the enemy. For the most part, wartime diplomacy focused on five issues: propaganda campaigns; defining and redefining the war goals, which became harsher as the war went on; luring neutral nations (Italy, Ottoman Empire, Bulgaria, Romania) into the coalition by offering slices of enemy territory; and encouragement by the Allies of nationalistic minority movements inside the Central Powers, especially among Czechs, Poles, and Arabs. In addition, multiple peace proposals were coming from neutrals, or one side or the other; none of them progressed very far.[342][343][344]

Legacy and memory


The Italian Redipuglia War Memorial, which contains the remains of 100,187 soldiers

Memorials were built in thousands of villages and towns. Close to battlefields, those buried in improvised burial grounds were gradually moved to formal graveyards under the care of organisations such as the Commonwealth War Graves Commission, the American Battle Monuments Commission, the German War Graves Commission, and Le Souvenir français. Many of these graveyards also have monuments to the missing or unidentified dead, such as the Menin Gate Memorial to the Missing and the Thiepval Memorial to the Missing of the Somme.[345][346]

In 1915, John McCrae, a Canadian army doctor, wrote the poem In Flanders Fields as a salute to those who perished in the war. Published in Punch on 8 December 1915, it is still recited today, especially on Remembrance Day and Memorial Day.[347][348]

A typical village war memorial to soldiers killed in World War I

National World War I Museum and Memorial in Kansas City, Missouri, is a memorial dedicated to all Americans who served in World War I. The Liberty Memorial was dedicated on 1 November 1921, when the supreme Allied commanders spoke to a crowd of more than 100,000 people.[349]

The British government has budgeted substantial resources to the commemoration of the war during the period 2014 to 2018. The lead body is the Imperial War Museum.[350] On 3 August 2014, French President François Hollande and German President Joachim Gauck together marked the centenary of Germany's declaration of war on France by laying the first stone of a memorial in Vieil Armand, known in German as Hartmannswillerkopf, for French and German soldiers killed in the war.[351] During the Armistice centenary commemorations, French President Emmanuel Macron and German Chancellor Angela Merkel visited the site of the signing of the Armistice of Compiègne and unveiled a plaque to reconciliation.[352]


... "Strange, friend," I said, "Here is no cause to mourn."
"None," said the other, "Save the undone years"... 

— Wilfred Owen, Strange Meeting, 1918[353]

The first tentative efforts to comprehend the meaning and consequences of modern warfare began during the initial phases of the war; this process continued throughout and after the end of hostilities and is still underway more than a century later. Teaching World War I has presented special challenges. When compared with World War II, the First World War is often thought to be "a wrong war fought for the wrong reasons"; it lacks the metanarrative of good versus evil that characterizes retellings of the Second World War. Lacking recognizable heroes and villains, it is often taught thematically, invoking tropes like the wastefulness of war, the folly of generals and the innocence of soldiers. The complexity of the conflict is mostly obscured by these oversimplifications.[354] George Kennan referred to the war as the "seminal catastrophe of the 20th century".[355]

Historian Heather Jones argues that the historiography has been reinvigorated by a cultural turn in the 21st century. Scholars have raised entirely new questions regarding military occupation, radicalisation of politics, race, medical science, gender and mental health. Among the major subjects that historians have long debated regarding the war include: Why the war began; why the Allies won; whether generals were responsible for high casualty rates; how soldiers endured the poor conditions of trench warfare; and to what extent the civilian home front accepted and endorsed the war effort.[356][357]

Unexploded ordnance

As late as 2007, signs warning visitors to keep off certain paths at battlefield sites like Verdun and Somme remained in place as unexploded ordnance continued to pose a danger. In France and Belgium, locals who discover caches of unexploded munitions are assisted by weapons disposal units. In some places, plant life has still not recovered from the effects of the war.[354]

See also


  1. ^ Russian Empire during 1914–1917, Russian Republic during 1917. The Bolshevik government signed a separate peace with the Central Powers shortly after their armed seizure of power, resulting in a Central Powers victory on the Eastern Front of the war, and Russian defeat. However, this peace treaty was nullified by an Allied Powers victory on the Western Front, and the end of the war.
  2. ^ The United States did not ratify any of the treaties agreed to at the Paris Peace Conference.
  3. ^ Bulgaria joined the Central Powers on 14 October 1915.
  4. ^ The Ottoman Empire agreed to a secret alliance with Germany on 2 August 1914. It joined the war on the side of the Central Powers on 29 October 1914.
  5. ^ The United States declared war on Austria-Hungary on 7 December 1917.
  6. ^ Austria was considered one of the successor states to Austria-Hungary.
  7. ^ The United States declared war on Germany on 6 April 1917.
  8. ^ Hungary was considered one of the successor states to Austria-Hungary.
  9. ^ Although the Treaty of Sèvres was intended to end the war between the Allied Powers and the Ottoman Empire, the Allied Powers and the Republic of Turkey, the successor state of the Ottoman Empire, agreed to the Treaty of Lausanne.
  10. ^ Often abbreviated as WWI or WW1; also called the Great War.
  11. ^ Only the Triple Alliance was a formal "alliance"; the others listed were informal patterns of support.
  12. ^ German: Skagerrakschlacht, or "Battle of the Skagerrak"
  13. ^ Bessarabia remained part of Romania until 1940, when it was annexed by Joseph Stalin as the Moldavian Soviet Socialist Republic;[164] following the dissolution of the USSR in 1991, it became the independent Republic of Moldova
  14. ^ Unlike the others, the successor state to the Russian Empire, the Union of Soviet Socialist Republics, retained similar external borders, via retaining or quickly recovering lost territories.
  15. ^ A German attempt to use chemical weapons on the Russian front in January 1915 failed to cause casualties.[263]
  16. ^ 109 in this context – see Long and short scales
  17. ^ World War I officially ended when Germany paid off the final amount of reparations imposed on it by the Allies.[302][303][304][305]


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