At West Point Military Academy in 1854, cadet Carl Rader (Van Heflin), an agent of John Brown, is dishonorably discharged for instigating a brawl among the cadets after distributing anti-slavery pamphlets which his classmates disapprove of—due to the controversial nature of the pamphlets (some believed the issue of slavery to be one that would inevitably resolve itself) and the U.S. Army's position against the pursuit of ideological causes while serving. Following the brawl, Rader's classmates Jeb Stuart (Errol Flynn) and George Custer (Ronald Reagan) become second lieutenants and are posted to Fort Leavenworth, Kansas Territory, the most dangerous duty in the Army—an assignment they relish. On the way to Kansas, Custer and Stuart meet Cyrus K. Holliday, in charge of building the railroad to Santa Fe, New Mexico, and his daughter Kit (Olivia de Havilland), with whom both officers fall in love.