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German submarine U-22 (1936)
German submarine ''U-22'' was a Nazi German Type IIB U-boat which was commissioned in 1936 following construction at the Germaniawerft shipyards at Kiel. Her pre-war service was uneventful, as she trained crews and officers in the rapidly expanding U-boat arm of the ''Kriegsmarine'' following the abandonment of the terms of the Treaty of Versailles two years before.
==War Patrols==
During the Second World War, she was mainly deployed for coastal work, a role enforced by her small size and endurance. Thus she was useful for operations in the North Sea and against the British coastal convoys, particularly along the north east seeboard of Great Britain. It was in this region that she scored her first successes, after fruitless operations off the Polish coast during the invasion of that country and a patrol against British shipping coming from Norwegian ports.
On 18 November 1939, she scored her first kill, sinking the tiny coastal cargo ship off the Scottish coast. This was followed on her fourth patrol with two mine barrages off Blyth, in Northumberland, which claimed two coastal freighters and a naval patrol minesweeper in less than a week. She was then used directly against Scottish convoys in the Moray Firth,〔''The Times Atlas of the World'' - Third edition, revised 1995, ISBN 0 7230 0809 4, p. 10〕 during which she achieved her greatest success, torpedoing the British destroyer , which went down with all hands, the cause of her loss only discovered by the British after the war. Shortly afterwards, in thick fog, she sank a Danish ship from the same convoy. These were her final direct victims, although she later claimed another with a mine laid sometime before.
The submarine failed to return from her seventh patrol, for which she had departed on 20 March 1940. There is some indication that she was lost due to an unexplained mine detonation in the Skagerrak.〔''The Times Atlas of the World'', p. 11〕 Some suggested, that she might have been rammed by the Polish submarine , which reported crashing into something, but it was a month later (20 June) and newest analyses show, that the ''Wilk'' most probably collided with a buoy.〔Andrzej S. Bartelski (in Polish). ''Prawdy i mity "Torpedy w celu"'' (Facts and myths in "Torpedo in target"). (Biuletyn DWS.org.pl Nr.6 ), ISSN 2080-5780, p.48-50〕 Whatever the cause, ''U-22'' and her 27 crew were never seen again, lost somewhere in the North Sea in March 1940.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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