Alan Ladd and Jay Silverheels (television's Tonto) are blood brothers whose bonds are tested when marauding Sioux Indians cross the border to enlist the peaceful Cree in a battle against the Great White Father. Canadian Mountie Thomas O'Rourke (Ladd) and his men must lead the sole survivor of a Sioux massacre, Shelley Winters, to safety across the border in Montana. Director Raoul Walsh and cinematographer John F. Seitz set the tense tale against a stunning Technicolor vision of the Canadian Rockies.