The US Army has decided to form an elite strike force similar to the British Commandos. Major William Darby (James Garner), a staff officer, gets command of the 1st Ranger Battalion, to be formed entirely from volunteers. On June 19, 1942 the 1st Ranger Battalion was sanctioned, recruited, and began training with British commando units in Dundee, Scotland. Darby and Master Sergeant Saul Rosen (Jack Warden), who also narrates the film, select a variety of men for training in Scotland by British Commando veterans. Darby tells his men that the Commandos are the best soldiers in the world, but in time they (the Rangers) will be. The Americans are quartered in Scottish homes and several of the Rangers pair off with local lassies: Rollo Burns (Peter Brown) with Peggy McTavish (Venetia Stevenson), the daughter of the fearsome but humorous Scottish Commando instructor, Sergeant McTavish (Torin Thatcher), and vagabond Hank Bishop (Stuart Whitman) with the proper Wendy Hollister (Joan Elan).