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Convoy JW 57 was an Arctic convoy sent from Great Britain by the Western Allies to aid the Soviet Union during World War II. It sailed in February 1944, reaching the Soviet northern ports at the end of the month. All ships arrived safely. For several days JW 57 was attacked by a German U-boat force; one escort vessel was sunk, and two U-boats were destroyed in counter-measures, during this operation. ==Ships== The convoy consisted of 45 merchant ships which departed from Loch Ewe on 20 February 1944. Close escort was provided by a force led by Cdr IJ Tyson in the destroyer ''Keppel'', with three other destroyers and four corvettes. The force was supported by an Ocean escort of 14 destroyers led by V.Adm IG Glennie in the cruiser ''Black Prince'', and the escort carrier ''Chaser'' with her escort of two destroyers and two frigates. The convoy was also accompanied initially by a local escort group from Britain, and joined later by a local escort group from Murmansk. There was no capital ship force providing distant cover, as Germany’s only remaining heavy unit in the Arctic, ''Tirpitz'', was still non-operational following the attack by British X-craft (Operation Source), but a cruiser cover force comprising ''Berwick'' and ''Jamaica'' followed the convoy, to guard against attack by smaller surface units. JW 57 was opposed by a U-boat force of 14 boats, arranged in two patrol lines code-named ''Werewolf'' (10 boats) and ''Hartmut'' (4 boats). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Convoy JW 57」の詳細全文を読む スポンサード リンク
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