Looking for WWII Movie

I saw a movie on AMC about a group of WWII pilots taken prisoner by the Nazis. One by one they unwaringly give away a bit of a secret until the Nazis can figure out what their mission is. They realize this as they are being transported by train, escape, and get word to the resistance. Instead of their comrades flying to their death as a result of their errors, they are able to bomb a field of fuel tanks. Problem is, I can't remember the name of the movie! Can anyone help?