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How effective were deck guns on submarines during World War 2? I know that the Germans in the Atlantic when attacking the convoys and the Americans in the Pacific going after Japanese shipping, to the extent that they designed and introduced a new gun, used them a fair bit but how important were they in the scheme of things compared to torpedoes? The British seem to of used them much less frequently so I was half wondering if they might not of been a good candidate to one of the first to drop deck guns, since IIRC their doctrine had submarines attacking warships rather than merchantmen.
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