Military Wiki
German submarine U-1231
Career (Nazi Germany)
Name: U-1231
Ordered: 14 October 1941
Builder: Deutsche Werft AG, Hamburg
Yard number: 394
Laid down: 31 March 1943
Launched: 18 November 1943
Commissioned: 9 February 1944
Fate: transferred as war booty to the Soviet Union
Career (Soviet Union)
Name: N-26
Acquired: 5 November 1945
Commissioned: 13 February 1946
Decommissioned: 29 December 1955
Renamed: B-26
Struck: 31 January 1968
Fate: broken up for scrap in 1968
General characteristics [1]
Type: Type IXC/40 submarine
Displacement: 1,144 t (1,126 long tons) surfaced
1,257 t (1,237 long tons) submerged
Length: 76.76 m (251 ft 10 in) o/a
58.75 m (192 ft 9 in) pressure hull
Beam: 6.86 m (22 ft 6 in) o/a
4.44 m (14 ft 7 in) pressure hull
Height: 9.6 m (31 ft 6 in)
Draft: 4.67 m (15 ft 4 in)
Propulsion: 2 × MAN M 9 V 40/46 supercharged 9-cylinder diesel engines, 4,400 hp (3,281 kW)
2 × SSW GU 345/34 double-acting electric motors, 1,000 hp (746 kW)
Speed: 18.3 knots (33.9 km/h; 21.1 mph) surfaced
7.3 kn (13.5 km/h; 8.4 mph) submerged
Range: 13,850 nmi (25,650 km; 15,940 mi) at 10 kn (19 km/h; 12 mph) surfaced
63 nmi (117 km; 72 mi) at 4 kn (7.4 km/h; 4.6 mph) submerged
Test depth: 230 m (750 ft)
Complement: 4 officers, 44 enlisted
Service record
Identification codes: M 43 319
Commanders: Kapt.z.S. Hermann Lessing
Oblt.z.S. Helmut Wicke

German submarine U-1231 was a Type IXC/40 U-boat built for Nazi Germany's Kriegsmarine during World War II.

U-1231 was ordered in October 1941 from Deutsche Werft AG Weser in Hamburg-Finkenwerder under the yard number 394. Her keel was laid down on 31 March 1943 and was launched on 18 November 1943. About three months later she was commissioned into service under the command of Kapitän zur See Hermann Lessing (Crew 21) in the 31st U-boat Flotilla.

After completing training and work-up for deployment U-1231 was transferred to the 33rd U-boat Flotilla for front-line service on 1 October 1944. The U-boat left Bergen on 18 October 1944 for the first war patrol operating unsuccessfully against Allied shipping in the North Atlantic and off the coast of Canada. After returning to Flensburg on 5 February 1945, Lessing was relieved as commander by Oberleutnant zur See Helmut Winke (Crew X/39). In April 1945 'U-1231 left Kiel for the North Atlantic, again operating without success. After the German surrender, Winke took U-1231 to Dundee, from where the U-boat was transferred to Lisahally.

In November 1945, U-1231 was allocated to the Soviet Union as war booty and was transferred to Libau via Copenhagen between 24 November and 5 December 1945. Renamed N-26 the U-boat was commissioned into the Soviet Navy and served with the Red Banner Baltic Fleet. On 29 December 1955, having been re-designated B-26, the U-boat was decommissioned and placed into reserve and used for training purposes. Struck from the list on 31 January 1968 and sold for scrap the U-boat was later broken up in Riga.


  1. Gröner 1985, pp. 105-6.
  • Busch, Rainer; Röll, Hans-Joachim (1999) (in German). Deutsche U-Boot-Verluste von September 1939 bis Mai 1945. IV. Hamburg, Berlin, Bonn: Mittler. ISBN 3-8132-0514-2. 
  • Gröner, Erich (1985) (in German). U-Boote, Hilfskreuzer, Minenschiffe, Netzleger, Sperrbrecher. III. Koblenz: Bernard & Graefe. ISBN 3-7637-4802-4. 

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