Had these missions before both in the American and German missions. The destroyers are at least veterans. They are bad boys. Expect detection.
Speaking from experience, the best option is a night submerged attack. Position yourself windward enough of the convoy to ensure that you are inside the destroyer formation when they pass by. You want to position yourself to unload all of your front tubes at around 500-700 yards as close to zero gyroangle as possible. When in initial position, go silent and wait. If you are detected, go ahead and take the shots as soon as practicable. Odds are in favor of a kill if you take your shots at no more than 1500 yards despite detection. Crash dive under the wreck and drop a decoy. Go deep, get skinny, get quiet and let the escorts bumble about while you slip away. The transport should be the only kill in this engagement. The rest of the convoy and the escorts are not worth the risk.
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