I wonder if the deck gun really WASN'T used that much early on in the war? The torps seem to have been pretty unreliable. And if you spotted a single cargo ship with no escort, as was common early on in the war, it would be easier and more efficient to blast it with a deck gun. Surface the sub about 700 meters from the cargo ship and WHAMMO...almost impossible to miss. Biggest worry would be rough water and aircraft. But again...not much aircraft threat early on. I'm using that very method early in my campaign to build up renown and get some practice sinking ships. I patrol in AN36 and often get British cargo ships with no escort. I man the deck gun myself and like to see the ship parts fly off into the sky
Dep