In a forerunner of
The Dirty Dozen, Marine
Gunnery Sergeant McGrath (Robert Webber) takes 12 Marines from the
brig and trains them to blow up a tunnel behind North Korean lines. McGrath's only friend on the patrol is his Korean guide Pak (
Dale Ishimoto). Hating their sergeant, the Marines plan to return to their lines without him, seeing that he becomes "a casualty of war". However, en route to their target they find an injured nun (Anna Sten) and a group of Korean convent girls whose bus has been destroyed. The Marines change their views when Sgt. McGrath protects the group. When one of their squad (
Leo Gordon) attempts to rape one of the young girls, the brig rats turn against him. They proceed with their mission as Marines. ==Cast==