It's an ironclad rule on U-56 right now in my Operation Monsun career, but only because she only carries five of them. I go for magnetic keel shots as much as possible.
In my RFB campaign, Christ, I'll empty the whole bow at one little Maru to compensate for deep-runners, duds and my general ineptness.
I think Steve's right, plenty of ships went down to one fish, but it was by no means the majority.
On the other hand, we'll never know how many went down to multiple fish where just one would have sufficed.
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