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The ''Redoutable''-class submarines were ocean-going submarines of the French Navy in the Second World War. They were officially called "Long patrol submarines" (Fr:''Sous-marins de grande patrouille''), or "Type 1 submarines".〔Conway p.274〕〔Type 1's were oceanic submarines; type 2's were coastal submarines; and type 3's were mine layers〕 They were also referred to as the 1500 Series, and regarded as being in three sub-classes〔Conway p.273〕〔Bagnasco p.38〕 (Though French Navy recognize only two〔Huan p.〕) The ''Redoubtable'' class were generally regarded as successful, being reliable and seaworthy, with a good range and armament. A total of 31 were built, the largest class of submarines built by the French Navy, and comprising one-third of its total submarine force. ==Development== The ''Redoutable'' class were built for service in the Atlantic, operating as scouts, or as commerce raiders, and for colonial service. They were built to conform to the interwar naval treaties arising from the 1922 Washington and 1930 London conferences, which placed restrictions on the number and size of warships of various types that nations could build.〔 The ''Redoutable'' class were designed and built as successors to the ''Requin'' class, France's first post-war Type 1 design. Orders were placed in 1924 for the first two boats, ''Redoutable'' and ''Vengeur'', followed by orders for seven more (1925), then five (1926), and a further five (1927). In 1929 a further order was placed for six boats of an improved design with more powerful engines, followed in 1930 by another six, again with improved engines and speed.〔 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「Redoutable-class submarine (1931)」の詳細全文を読む スポンサード リンク
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