S1·E29 The Hour Glass Raid

After capturing Dr. Anderson, a skilled Allied physician, Dietrich ends up turning over his staff car in a ravine (during a blinding sand storm). Troy wants to attempt to rescue the doctor but can't because of the storm. He hears Dietrich's distress call but suspects it is a trick. In the end they do make the attempt as they hear that the Germans are going to do the same. They get Dr. Anderson--who is fine--but Dietrich is trapped under the car and badly injured. The doctor tells them that Dietrich is dead but the German groans just before the Patrol leaves. When Troy ends up saving Dietrich's life, the doctor was about to kill him with a murderous dose of morphine, Dietrich tells Troy that Anderson is a double agent. Anderson ends up getting killed just as the Germans arrive to help their captain.