Bronco leads a wagon train of ex-Confederates from Virginia on their way to Oregon. They are at Fort Bridger trying to buy six horses from a horse trader. Bronco makes him an offer that he accepts that seems too good to be true. Meanwhile, Jonathan Hawley, a member of wagon train, is trying to trade a brooch at the Army sutler while Private Frankie Benton watches. Benton has been losing at cards but against the advise of the sutler, he returns to play. The small wagon train runs into an Army patrol led by Lieutenant Ames looking for a deserter charged with robbing and murdering the sutler. The encounter arouses bad feelings especially for the rebels but Bronco gives his word they haven't seen the deserter. Complicating matters the Yankee deserter, Private Benton, is found stowed away in one of the wagons. Also, an outlaw group in the area led by a man who wants revenge on Bronco, whom he blames for his war time court-martial, attacks to steal back the horses Bronco purchased. It is ...