The Great Escape (1963)

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 movie 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 planes, trains, and boats to get out of occupied Europe.