Bob Evans, a telegraph operator, together with a group of soldiers gets ambushed by Sioux Indians. Wounded, he climbs into a telegraph pole and asks through the telegraph wires for help from the fort. Bob's fiancée Edith comes along with the soldiers. The soldiers find only dead bodies and decide to chase the Indians. Edith stays behind to search for Bob. She finds him and together they return to the fort. The Sioux then attack the fort, but when the situation seems hopeless, the army returns and the Indians are expelled.

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.