Soldier Blue is an American Revisionist Western from 1970, directed by Ralph Nelson, telling a fictionalised account of the events surrounding the 1864 Sand Creek massacre in the Colorado Territory. It was written by John Gay based on the novel "Arrow in the Sun" by Theodore V. Olsen and starred Candice Bergen, Peter Strauss, and Donald Pleasence. The title song was performed by Buffy Sainte-Marie. Released during the height of the Vietnam War against the backdrop of the Mỹ  Lai massacre, it provided a depiction of a notorious incident in the history of the American frontier, in which troops massacred an undefended village of Cheyenne and Arapaho Indians. The film creates a back story involving the escape of white survivors from an earlier massacre of U.S. Cavalry troops by Indians. The film was controversial at the time not only as a revisionist western but for its graphic levels of violence. Director Nelson, pushed the depiction of the violence to new levels, showing graphic rape scenes, as well as "realistic" atrocities.