During the Battle of the Bulge in World War II, U.S. Army intelligence officer First Lieutenant Thomas Hart (Farrell) is captured by German forces. While interrogating Hart, the Germans coerce him to divulge intelligence by taking away his boots, causing his feet to become frostbitten and badly injured, and leaving him, naked, in a very cold cell. He is then transferred by train to Stalag VI-A prisoner of war camp at Hemer. While en route, a P-51 Mustang attacks (the letters POW were painted on the top of the train, but got covered by thick snow). To save themselves, the POWs leave the train and spell P-O-W with their bodies and prevent further strafing.