The troop's best known action during the Napoleonic Wars came in June 1815 at the Battle of Waterloo. Under the command of Captain Mercer, the battery was equipped with five 9 pounder cannons and a 5½" howitzer.[3][4][a] Initially placed on the right, it was ordered to assist in repelling an attack by French cavalry at the centre of the allied line. It beat off repeated charges by the French, disobeying previously issued orders from the Duke of Wellington that gunners were to abandon the guns and take refuge inside nearby infantry squares as the enemy closed.[7] In commemoration of this action, the troop was named after Mercer.[2][b]
In the usual post-war reductions of the British Army, a number of troops of horse artillery were disbanded between 1815 and 1816, including D Troop (Beane's Troop) on 31 July 1816.[9] The remaining troops were then moved up to assume the next available letter[10] and the G Troop became F Troop on the same date.[1]
Indian Mutiny
The troop was dispatched to India in 1858 to assist in the final operations to quell the Indian Rebellion of 1857.[11] From 1 July 1859, while still in Bengal, it was assigned to the Horse Brigade, Royal Artillery[12] along with all the existing horse artillery batteries of the Royal Artillery. This was an administrative, rather than tactical, formation.[13]
As a result of the Rebellion, the British Crown took direct control of India from the East India Company on 1 November 1858 under the provisions of the Government of India Act 1858. The Presidency armies transferred to the direct authority of the British Crown and its European units were transferred to the British Army. Henceforth artillery, the mutineers most effective arm, was to be the sole preserve of the British Army (with the exception of certain Mountain Artillery batteries). On 19 February 1862, the Horse Brigade RA became the 1st Horse Brigade RA and the Bengal, Madras and Bombay horse artillery formed the 2nd to 5th Horse Brigades.[14][c]
Late Victorian era
The 1st Brigade with 10 batteries was much larger than the other four (with four to seven batteries each). Therefore, a reorganization of the Horse Artillery on 13 April 1864 saw 1st Brigade split as A and B Brigades.[15][d] The battery was moved to B Brigade, and as battery designations were tied to the brigade the battery was assigned to, it was redesignated as C Battery, B Brigade (or C/B Battery in short).[1]
From 1866, the term "Royal Horse Artillery" appeared in Army List[16] hence the battery was designated C Battery, B Brigade, Royal Horse Artillery from about this time. Another reorganization on 14 April 1877 saw the number of brigades reduced to three (of 10 batteries each); the battery joined A Brigade and became G Battery, A Brigade.[17] The number of brigades was further reduced to two (of 13 batteries each) in 1882 without effecting the designation of the battery.[18]
The brigade system was finally abolished on 1 July 1889. Henceforth, batteries were designated in a single alphabetical sequence in order of seniority from date of formation[19] and the battery took on its final designation as G Battery, Royal Horse Artillery.[1]
The brigade system was reintroduced on 1 March 1901, this time as tactical formations, and the battery was assigned to the XI Brigade-Division, RHA (redesignated as V Brigade, RHA on 1 October 1906) along with O Battery[25] and was stationed at Ambala.[26]
On 24 November 1914, G Battery was transferred to XV (later IV) Brigade, RHA in 3rd Cavalry Division.[29] In practice, the batteries were permanently assigned to the cavalry brigades and G Battery served with 8th Cavalry Brigade.[30] It joined too late to take part in any of the 1914 actions, but in 1915 saw action in the Second Battle of Ypres (Battle of Frezenberg Ridge, 11–13 May) and the Battle of Loos (26–28 September). 1916 saw no notable actions, but in 1917 it took part in the Battle of Arras (First Battle of the Scarpe, 9–12 April).[31] At other times, the battery served in the trenches as infantry.[21]
In March 1918, the 4th (formerly 1st Indian) and 5th (formerly 2nd Indian) Cavalry Divisions were broken up in France. The Indian elements were sent to Egypt where they formed part of the new 4th and 5th Cavalry Divisions which played a major part in the successful conclusion of the Sinai and Palestine Campaign. The British and Canadian units remained in France[32] and most of them were transferred to the 3rd Cavalry Division causing it to be extensively reorganized.[30]
In March 1918, 8th Cavalry Brigade was broken up. It was replaced in 3rd Cavalry Division by the Canadian Cavalry Brigade with its attached Royal Canadian Horse Artillery Brigade (A and B Batteries, RCHA each with four 13 pounders) from the disbanding 5th Cavalry Division.[30] On 13 March, G Battery was posted to XVII Brigade, RHA (formerly with 5th Cavalry Division[33]) to bring it back up to three batteries.[34]
This was a short-lived arrangement: on 9 April, G and N Batteries left for V Army Brigade RHA.[35][f] At some point, the battery was re-armed with 18 pounders. At the Armistice, V Army Brigade RHA was serving as Army Troops with the Fourth Army[36] with G, N, O and Z Batteries RHA (twenty four 18 pounders).[37]
Inter-war period
The battery took part in the Victory Parade in Paris in July 1919,[35] and returned to the United Kingdom (Aldershot) from Germany in October.[38] Still assigned to V Brigade, it remained at Aldershot until November 1926 when it was transferred to Meerut.[39] In 1927, V Brigade was broken up and the battery remained at Meerut, unbrigaded.[40]
From 1938 artillery regiments were reorganized from three six-gun batteries to two 12-gun batteries. Rather than disband existing batteries, they were instead linked in pairs. As a result, G Battery was linked with F Battery to form F/G Battery on 28 May 1939.[1][43][g] In the event, the batteries were unlinked within months (on 25 November 1939) and the battery resumed its individual existence.[1][43]
Second World War
At the outbreak of the Second World War, the battery was still linked with F Battery as F/G Battery in 4th Regiment, RHA and still in Egypt. It was unlinked on 25 November 1939 and simultaneously assigned to the 5th Regiment, RHA at Wotton-under-Edge, Gloucestershire. It remained part of 5th RHA for the rest of the war.[45]
Other than a period from 1977 to 1984 when the battery (and the regiment) was rerolled as a field artillery unit and posted to the BAOR in Germany, it has been based in England, initially at Aldershot but latterly at Colchester.[57]
Operation Pitting. In August 2021, members of G Bty TAC Group (held at high readiness), deployed to Kabul in Afghanistan. This was to aid in the extraction of British Nationals, following the rapid Taliban advance across the country and into the city. Over 15,000 eligible Afghans and British Nationals successfully evacuated, in an operation that marked the end of the UK’s 20-year military campaign in Afghanistan.[57]
^Other sources state that the battery was armed exclusively with 9 pounder cannons.[5][6]
^The Honour Title "Mercer's Troop" was officially granted on 13 October 1926.[8]
^The 1st Brigade Bengal Horse Artillery became 2nd Horse Brigade RA, the Madras Horse Artillery became 3rd Horse Brigade RA, the Bombay Horse Artillery became 4th Horse Brigade RA and the 2nd Brigade Bengal Horse Artillery became 5th Horse Brigade RA. The 3rd Brigade Bengal Horse Artillery was split between 2nd and 5th Horse Brigades RA.[14]
Clarke, W.G. (1993). Horse Gunners: The Royal Horse Artillery, 200 Years of Panache and Professionalism. Woolwich: The Royal Artillery Institution. ISBN09520762-0-9.
Frederick, J.B.M. (1984). Lineage Book of British Land Forces 1660–1978. Wakefield, Yorkshire: Microform Academic Publishers. ISBN1-85117-009-X.
Joslen, Lt-Col H.F. (1990) [1st. Pub. HMSO:1960]. Orders of Battle, Second World War, 1939–1945. London: London Stamp Exchange. ISBN0-948130-03-2.
Perry, F.W. (1993). Order of Battle of Divisions Part 5B. Indian Army Divisions. Newport: Ray Westlake Military Books. ISBN1-871167-23-X.
Order of Battle of the British Armies in France, November 11th, 1918. France: General Staff, GHQ. 1918.