Not a single one, as far as I know. The only recorded one, to the best of my knowledge, was an attack against a surfaced submarine. They couldn't attack submerged boats; they didn't have homing torpedoes yet.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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