Based on a true story, a group of allied escape artist type prisoners of war are all put in an 'escape proof' camp. Their leader decides to try to take out several hundred all at once. The first half of the film is played for comedy as the prisoners mostly outwit their jailers to dig the escape tunnel. The second half is high adventure as they use boats and trains and planes to get out of occupied Europe.
"The government ruling us draws its authority not from the principles of the Declaration of Independence, or even from the delegate powers listed in the U.S. Constitution, but rather from the war to re-conquer the independent South. That conflict, usually referred to by the artfully misleading title Civil War, established the fact that the government in Washington is willing to kill Americans in whatever quantity it deems necessary in order to enforce its edicts, and then sanctify the slaughter in the name of some suitably progressive social objective.