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The Canadian corvette that rammed a U-boat and sent a half-naked sailor to board it

In August 1942, HMCS Oakville joined the fight against U-94 in the Caribbean after an Allied aircraft damaged the German ...

What does the 'U' in U-boat stand for and how many of them are left?

Few naval vessels have developed as enduring of a legacy as German U-Boats, but what does that name actually mean?