My only success with using torpedoes against moving targets has been against destroyers that are chasing me. After I sunk 2 battleships and a carrier in a port (docked), I escaped but 3 destroyers wanted my head for sinking their ships. I sunk all 3. The first two were killed as they were chasing me. I sunk each with one torpedo. The other one was smarter and approached at an angle. So I estimated his angle using the periscope and launched a salvo of 4 torpedoes. One of them hit and destroyed him. It was the last destroyed I faced which is good since I had no more internal torpedoes.
So I guess it's not completely unrealistic to sneak into enemy ports since I had to fight it out with destroyers in shallow waters.
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