During the Civil War, in Wyoming, horse dealers Joan Britton (Faith Domergue) and Stephen Cook (Lyle Bettger) are competing to supply the Union Army with horses. A Cherokee, Stan Watie, is in the area to stir up the Sioux against the Union just as Cook decides to steal a herd of Sioux horses. Ex-army doctor Jonathan Westgate (Jeff Chandler), opposes Cook's unscrupulous methods as well as being Cook's rival for the affections of Joan. It seems Westgate is the only one able to prevent a new Indian war.