History, as portrayed in this film, has been a succession of conquests of stronger races over weaker ones. As played out on the stage of Monument Valley, long ago, tribes of Indians defeated the ancient cliff dwellers; then came the Europeans to conquer the Indians. Now, in the early 20th Century, a tribe of Navajo live on a reservation overseen by an Indian-hating agent, Booker. He and his men steal the best Indian horses for their own profit. Nophaie, a tribal leader, complains to Booker's higher-ups, but he is unable to gain fair treatment from the whites. When World War I breaks out, an Army captain comes west in search of the horses that Booker was supposed to have bought from the Indians for a fair price. Marian Warner, the teacher at the Indian School, has befriended Nophaie, teaching him to read; she convinces him that the Great War is a fight for a more just world, and that, when that world comes, the Indian will be better treated.