IMHO it's not historic/realistic. The main focus of the U-boat campaign was sink the supplies that were pouring into England. Escorts don't carry supplies, merchants do. If you have a chance of sinking a warship, go for it, but if you have the choice between a DD and a C2 loaded with supplies, go for the C2.
By sinking the escorts of a convoy, you're wasting torpedos that can be used better.
Anyway, just my 2 cents...
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Quack!
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