One of my all time favorite movies, but as I recall, all the Americans were transferred out of the camp before the escape occurred.
Also, Donald Pleasence, on 31 August 1944, his Lancaster NE112 was shot down during an attack on Agenville, and he was captured and imprisoned in the German prisoner-of-war camp Stalag Luft I.
He would have escaped in real life, but his glasses were broken.