Based on a story by Bernard McConville and Karen DeWolf, and a screenplay by Dorrell and Stuart E. McGowan, the film is about a Texas Ranger working undercover to protect an Army wagon train full of ammunition and supplies.

The American Federal Government now wants to make friends with the hostile Comanche, blaming the hot headed Rangers and all other Texans for inciting the Indians.

Their romantic aspirations are cut short when an Indian party wish to have a talk with the cavalry but wearing war paint is spotted by Autry and his scout Rufe.

Gene and his buddies, Frog Millhouse (Smiley Burnette) and Rufe Jones (Max Terhune), suspect that Duval is working with the Indians, and they go to his canteen to investigate.

Known to the Indians as Chief Tavibo, Duval is now free to continue his plot to re-route a supply train so that the Comanches can attack and capture the cavalry's ammunition.