At Fort Adobe, Texas, scout Gene Autry and cavalry lieutenant Bob Cameron are competing for the attentions of Colonel Summerall's daughter Dixie, when an Indian war party calls them to duty. A peace treaty is signed with the help of Duval, the Fort's interpreter, but Gene and his buddies, Rufe and Frog Jones, suspect Duval may be working with the Indians and go to his canteen to investigate. There, Duval's attempt to kill Gene results in a barroom brawl, after which, Gene and his friends are court-martialed. Gene tries to warn Colonel Summerall and Major Crosby about the interpreter, but is arrested for the murder of a Comanche brave. Gene's arrest leaves Duval, whom the Indians know as "Tavibo," free to continue his plot to re-route a supply train so that the Comanches can attack and capture the cavalry's ammunition. Gene escapes jail and joins the bloody fight between the cavalry and the Comanches. Frog arrives with the Rangers to win the battle, during which Duval is killed and his true identity is revealed. Finally, after peace is restored, Colonel Summerall apologizes to Gene, and Gene wins Dixie as his bride.