Austrian farmer Franz Jägerstätter faces the threat of execution for refusing to fight for the Nazis during World War II.

The stooges are auto mechanics working for the R.A.F. in England. After wrecking an officers car they need a place to hide, but their choice, a sewer pipe, turns out to a bomb which is dropped on the enemy. Finding themselves behind enemy lines, Moe and Curly disguise as German officers and Larry dresses as a seductive fraulein. While general Bommel chases after Larry, Moe and Curly steal the secret plans from the high command.