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Monsun Gruppe
The ''Gruppe Monsun'' or Monsoon Group was a force of German U-boats (submarines) that operated in the Pacific and Indian Oceans during World War II. Although similar naming conventions were used for temporary groupings of submarines in the Atlantic, the longer duration of Indian Ocean patrols caused the name to be permanently associated with the relatively small number of U-boats operating out of Penang, (with its capital, George Town) 〔Paterson Lawrence(2004), ''Hitler's Grey Wolves: U-boats in the Indian Ocean p.29〕 The Indian Ocean was the only place where German and Japanese forces fought in the same theatre. To avoid incidents between Germans and Japanese, attacks on other submarines were strictly forbidden.〔Paterson Lawrence (2006), ''Hitler's Grey Wolves: U-boats in the Indian Ocean''〕 Altogether 41 U-boats of all types including transports would be sent; a large number of these, however, were lost and only a small fraction returned to Europe.〔(Fate of the Far Eastern Boats )〕〔(Monsun boats Evacuation )〕
==Indian Ocean trade routes==
The Indian Ocean was considered strategically important, containing India, and the shipping routes and strategic raw materials that the British needed for the war effort. In the early years of the war German merchant raiders and pocket battleships had sunk a number of merchant ships in the Indian Ocean; however as the war progressed it became more difficult for them to operate in the area and by 1942 most were either sunk or dispersed. From 1941, U-boats were also considered for deployment to this area but due to the successful periods known as the First and Second Happy Times, it was decided that sending U-boats to the Indian Ocean would be an unnecessary diversion. There were also no foreign bases in which units could operate from and be resupplied, hence they would be operating at the limits of their range. As a result, the Germans concentrated primarily on their U-boat campaign in the North Atlantic.
Japan’s entry into the war in 1941 led to the capture of European South-east Asian colonies such as British Malaya and the Dutch East Indies. In May and June 1942, Japanese submarines began operating in the Indian Ocean and had engaged British forces in Madagascar. The British had invaded the Vichy-controlled island in order to prevent it from falling into Japanese hands — however, as Japan was never known (from post-war evaluation) to have had plans to place Madagascar within its own sphere of influence, Britain's defense of the island could also have been surmised to have been a plausible defense against any possibility of Madagascar falling under Germany's own ambitions.
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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