What was the WWII movie where the Germans try to trick an American that it is

Jim

New member
after the war? There was a big budget World War II movie made in the 70s or so, with a famous star, where the Germans try to convince him that he was in a coma, it is after the war, he is in a sanitarium, etc. It is all a scheme to get him to reveal military secrets. Alas, I can't remember the name of the movie or the actor, and searching on this concept is too vague. It takes a human memory! :-) Can you help?
 
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