Military Wiki
German submarine U-1223
Career (Nazi Germany)
Name: U-1223
Ordered: 25 August 1941
Builder: Deutsche Werft AG, Hamburg
Yard number: 386
Laid down: 25 November 1942
Launched: 23 June 1943
Commissioned: 6 October 1943
Decommissioned: 14 April 1945
Fate: scuttled 5 May 1945 in position 53°32′N 8°35′E / 53.533°N 8.583°E / 53.533; 8.583Coordinates: 53°32′N 8°35′E / 53.533°N 8.583°E / 53.533; 8.583[1]
General characteristics [2]
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
Part of: 4th U-boat Flotilla
2nd U-boat Flotilla
33rd U-boat Flotilla
Identification codes: M 53 099
Commanders: Kptlt. Harald Bosüner
Oblt.z.S. Albert Kneip
Operations: 1 patrol
Victories: 2 ships damaged

German submarine U-1223 was a Type IXC/40 U-boat built for Nazi Germany's Kriegsmarine during World War II.

U-1223 was ordered in August 1941 from Deutsche Werft in Hamburg-Finkenwerder under the yard number 385. Her keel was laid down on 2 November 1942 and was launched the following year on 6 June 1943. About three months later she was commissioned into service under the command of Kapitänleutnant Harald Bosüner (Crew 35) in the 4th U-boat Flotilla.

While working up for deployment, U-1223 Bosüner was relieved and handed over command to Oberleutnant zur See Albert Kneip (Crew X/39) on 3 March 1944. After completing training, the U-boat transferred to the 2nd U-boat Flotilla and left Kiel for the West Atlantic on 3 August 1944 for her first and only patrol. Stopping briefly in Bergen, Norway, for replenishment, she operated off the Canadian coast, damaging HMCS Magog on 14 October 1944 and the British steamer SS Fort Thompson on 2 November. Magog was towed back to port, but declared a constructive loss and decommissioned.

U-1223 arrived back in Kristiansand on Christmas Eve, 24 December 1944, and continued her journey to Flensburg, where she arrived three days later. Having been transferred to the 33rd U-boat Flotilla, she left Flensburg again for Königsberg on 5 January 1945, arriving there on the 10th. The U-boat experienced technical problems in the end of January 1945 and had to be towed into Stettin. From there she travelled under tow of U-1108 to Wesermünde, where she was decommissioned on 15 April 1945. Most of her crew was ordered to form a tank destroyer unit in Neustadt in Holstein under the command of the 1st watch officer.

When British forces closed in on the port, the U-boat was scuttled in position 53°32′N 8°35′E / 53.533°N 8.583°E / 53.533; 8.583 on 5 May 1945. Her wreck was later broken up for scrap.[1]


  1. 1.0 1.1 Busch & Röll 1999, p. 340.
  2. 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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