Deck gun was seldom used by the Germans - it was main weapon in WWI but in WWII it was used only to finish off ships not worth a torpedo and in as safe conditions as possible, or to take down small crappy vessels. Deck guns were used in the opeartion Paukenschlag due to the lack of ASW means but later they were removed. Keep in mind, that with manned and prepared deck gun it took much longer to dive.
Americans used deck guns against small vessels mostly - AFAIR the greatest ship sunk by an American submarine`s gun was like 2000 BRT.
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