Ap, a few years ago historian David O'Keefe discovered declassified documents that point out that the Dieppe raid was a diversion so a very small commando would capture an Enigma machine that was in the German Naval Headquarter in the city of Dieppe. The pinch raid, like they called it, failed like most of the Dieppe raid. All the vets David O'Keefe interviewed said they had no idea it was about the Enigma. Kinda make sense, since at the time the enigma was cutting edge technology and any attempt to capture it, successful or not would have been kept in the outmost secrecy. It is all in a Discovery channel documentary, it is quite good.