Yes, I have seen minimally escorted Conviys (One destroyer), but that is not what you are asking. Have not seen any without. They went by the saying "A poorly escorted convoy is worse than no convoy".
They do run out of DC's, but that's ship class dependent.
AS mention in other threads:
Go deep (>150m, I like to sit around 220m, but test your boat each patrol so you know how far you can go)
Slow. (Click just below 1 knot is the consensus, but to each their own)
And long slow turns, 5-15' on the rudder. Don't give them a constant target.
If you're attacking a convoy, and if it's possible, use the convoy itself to peel the escorts off you. let the ships run over you, the escorts won't be able to get at you.
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Luck is a residue of Design.
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