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	German U-boat U-139
History
German Empire
Name	U-139
Ordered	1 August 1916
Builder	Germaniawerft, Kiel
Yard number	300
Launched	3 December 1917
Commissioned	18 May 1918
Renamed	Halbronn
Fate	Surrendered to France on 24 November 1918
France
Name	Halbronn
Acquired	24 November 1918
Decommissioned	24 July 1935
Fate	Broken up
General characteristics
Class and type	Type U 139 submarine
Displacement	1,930 t (1,900 long tons) surfaced; 2,483 t (2,444 long tons) submerged;
Length	92.00 m (301 ft 10 in) (o/a); 71.50 m (234 ft 7 in) (pressure hull);
Beam	9.12 m (29 ft 11 in) (o/a); 5.75 m (18 ft 10 in) (pressure hull);
Height	5.27 m (17 ft 3 in)
Draught	11.20 m (36 ft 9 in)
Installed power	2 × 3,300 PS (2,427 kW; 3,255 shp) ; 2 × 450 PS (331 kW; 444 shp) surfaced; 2 × 1,780 PS (1,309 kW; 1,756 shp) submerged;
Propulsion	2 shafts, 2 × 2.10 m (6 ft 11 in) propellers
Speed	15.3 knots (28.3 km/h; 17.6 mph) surfaced; 7.6 knots (14.1 km/h; 8.7 mph) submerged;
Range	12,630 nmi (23,390 km; 14,530 mi) at 8 knots (15 km/h; 9.2 mph) surfaced; 53 nmi (98 km; 61 mi) at 4.5 knots (8.3 km/h; 5.2 mph) submerged;
Test depth	75 m (246 ft 1 in)
Complement	6 (1) officers, 56 (20) enlisted – (prize crew)
Armament	6 × 50 cm (19.7 in) torpedo tubes (four bow, two stern); 19-24 torpedoes; 2 × 15 cm (5.9 in) SK L/45 deck guns;
Service record
Part of:	U-Kreuzer Flotilla; Unknown start – 11 November 1918;
Commanders:	Kptlt. Lothar von Arnauld de la Perière; 18 May – 11 November 1918;
Operations:	1 patrol
Victories:	3 merchant ships sunk ; (6,301 GRT); 1 auxiliary warship sunk ; (487 GRT); 1 auxiliary warship damaged ; (2,502 GRT);

Triangular weather flag of SM U-139. Flag is red with white circle in the middle. — Weather flag of SM *U-139* at the National Museum of the United States Air Force.

SM U-139 was the lead ship of her class, one of the submarines serving in the Imperial German Navy in World War I. She was commissioned on 18 May 1918 under the command of Lothar von Arnauld de la Perière, who named the submarine Kapitänleutnant Schwieger, after Walther Schwieger, who had sunk the Lusitania in 1915. She only sailed on one war patrol, during which she sunk four ships. U-139 surrendered to France on 24 November 1918 and shortly afterwards became French submarine Halbronn (until 24 July 1935 when she was broken up).

Action of 14 October 1918

On the 14 October 1918, U-139 attacked the Portuguese civilian steamer SS São Miguel, which was being escorted by the Portuguese Navy small naval trawler NRP Augusto de Castilho in the Atlantic Ocean. Augusto Castilho covered the escape of São Miguel by engaging U-139 for several hours, until being destroyed.^[3]

Summary of raiding history

Date	Name	Nationality	Tonnage^{[Note 1]}	Fate^[4]
1 October 1918	Bylands	United Kingdom	3,309	Sunk
1 October 1918	Manin	Kingdom of Italy	2,691	Sunk
1 October 1918	HMS Perth	Royal Navy	2,502	Damaged
2 October 1918	Rio Cavado	Portugal	301	Sunk
14 October 1918	Augusto De Castilho	Portuguese Navy	487	Sunk

References

Notes

^ Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.

Citations

^ Gröner 1991, pp. 19–21.
^ Helgason, Guðmundur. "WWI U-boats: U 139". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 7 December 2014.
^ James H. Guill, "the only battle of note that occurred near the Azores during this period took place 14 October 1918 between the German U-139 and Portugal's ships São Miguel and Augusto Castilho.", page 507.
^ Helgason, Guðmundur. "Ships hit by U 139". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 7 December 2014.

Bibliography

Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.