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The Arctic convoys of World War II were oceangoing convoys which sailed from the United Kingdom, Iceland, and North America to northern ports in the Soviet Union - primarily Arkhangelsk (Archangel) and Murmansk, both in modern-day Russia. Although there were two gaps with no sailings between July and September 1942, and March and November 1943, there were 78 convoys between August 1941 and May 1945,〔(telegraph.co.uk: "Arctic Convoys of World War Two: 70 years since Britain went to the Soviet Union's aid" 21 Sep 2011 )〕 sailing via several seas of the Atlantic and Arctic oceans. About 1400 merchant ships delivered essential supplies to the Soviet Union under the Lend-Lease program, escorted by ships of the Royal Navy, Royal Canadian Navy, and the U.S. Navy. Eighty-five merchant vessels and 16 Royal Navy warships (two cruisers, six destroyers, eight other escort ships) were lost. Nazi Germany's ''Kriegsmarine'' lost a number of vessels including one battleship, three destroyers and at least 30 U-boats as well as a large number of aircraft. The convoys demonstrated the Allies commitment to helping the Soviet Union, prior to the opening of a Second Front, and tied up a substantial part of Germany's Navy and Air Force.〔(Imperial War Museum: "Arctic Convoys" )〕 ==Convoy organisation== The Arctic convoys ran in two series, following the first convoy, which was un-numbered but code-named “Dervish”.〔 The first series, PQ (outbound) and QP (homebound), ran from September 1941 to September 1942. These convoys ran twice monthly, but were interrupted in the summer of 1942 when the series was suspended after the disaster of PQ17 and again in the autumn after the final convoy of the series, PQ18, due to lengthening daylight hours, and continued preparations for Operation Torch. The second series of convoys, JW (outbound) and RA (homebound) ran from December 1942 until the end of the war, though with two major interruptions in the summer of 1943 and again in the summer of 1944. The convoys ran from Iceland (usually off Hvalfjörður) north of Jan Mayen Island to Arkhangelsk when the ice permitted in the summer months, shifting south as the pack ice increased and terminating at Murmansk. After September 1942 they assembled and sailed from Loch Ewe in Scotland. Outbound and homebound convoys were planned to run simultaneously; a close escort accompanied the merchant ships to port, remaining to make the subsequent return trip, whilst a covering force of heavy surface units was also provided to guard against sorties by German surface ships, such as ''Tirpitz''. These would accompany the outbound convoy to a cross-over point, meeting and then conducting the homebound convoy back, while the close escort finished the voyage with its charges. The route was around occupied Norway to the Soviet ports and was particularly dangerous due to the proximity of German air, submarine and surface forces and also because of the likelihood of severe weather, the frequency of fog, the strong currents and the mixing of cold and warm waters which made ASDIC use difficult, drift ice, and the alternation between the difficulties of navigating and maintaining convoy cohesion in constant darkness or being attacked around-the-clock in constant daylight. 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「Arctic convoys of World War II」の詳細全文を読む スポンサード リンク
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