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Brothers end up on opposite sides of the law in this Western set during the Civil War. Posing as a Union officer, Don Mason, aka Don Burke (Milburn Stone), attempts to divert the Union troops from the struggle with the Confederacy by arming the Colorado Indian tribes. Unbeknownst to Don, however, his younger brother Jerry (Roy Rogers) is assigned by President Lincoln to investigate the uprisings in the territory and the youngster arrives just as Don is preparing to marry Lylah Sanford (Pauline Moore). With the aid of grizzled sidekick Gabby (George "Gabby" Hayes), Roy manages to disarm the crooked Indian commissioner (Arthur Loft) but Don slips away with Lylah as his hostage. Roy is wounded in the ensuing shootout and is nursed back to health by Lylah, with whom he has fallen in love. There is the inevitable showdown between the brothers but rather than face the hangman, Don makes a daring escape and is shot and killed by Sheriff Harkins (Fred Burns).