Cliff Barton, suspicious of the intentions of the local banker, Seth Tolliver, withdraws his money from the bank, hides it, and is later killed by two hirelings of the banker. Deputy Sheriff Art Stratton, who has trained Barton's horse and is in love with his daughter, Thora, is assigned to guard the ranch for the creditors; and Tolliver, who has designs on the property and wants his son to marry Thora, arranges to have the ranch auctioned.

The U.S. Army and the Indians sign a peace treaty. However, a group of surveyors trespass on the Indians' land and violate the treaty. The army refuses to listen to the Indians' complaints, and the surveyors are killed by the Indians. A vicious Indian war ensues, culminating in an Indian attack on an army fort.