Did the allies use captured e-boats and s-boat during world war 2?

Answer 1

== == No . Too risky to do that. The outline of those ships was very distinctive, and to put a Allied crew on them was to risk being "shot up by your own side" at night. If one was captured it would be carefully examined to see what the design was like, and to find it's weakness, then it would be sunk at sea. The same attitude applied to catured German aircraft. Examine and then destroy.