The Devil's Brigade tells the story of First Special Service Force, the joint Canada-US World War II commando group under the command of Col. Robert T. Frederick (William Holden). The Canadians are the best that the Canadian army has to offer: spit and polish, multi-skilled and all experienced soldiers. The Americans are the dregs of the US Army: misfits and troublemakers lacking any kind of discipline. Over time, Frederick forges a unified, highly competent fighting force. Initially trained for a commando operation in Norway, Frederick has to move quickly to keep the unit together after the operation is cancelled. They are sent to Italy where they distinguished themselves in numerous battles