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Assistant director Ignacio Villarreal's surname was misspelled "Villareal" in the onscreen credits. The film was, according to an onscreen acknowledgment, "filmed in its entirety in Durango in Old Mexico for historical authenticity....Most of the characters, places, dates and events in this story are factual." The real Quanah Parker, a chief of the powerful Kwahadie band, grew up fighting whites, even though his mother, Cynthia Parker, was white. In 1874, Quanah led a combined force of over seven hundred Comanche, Kiowa, Arapaho and Cheyenne warriors in an unsuccessful attack on Adobe Walls, an old trading post in the Staked Plain of Texas.
That summer, generals Miles and Mackenzie pursued and fought the Indians until, hungry and demoralized, they began to surrender. Quanah, the last of the Comanches to surrender, came in under a flag of truce in June 1875. As a reservation Indian, he learned the ways of whites while continuing to lead his people and maintain his customs and heritage as an Indian. The dialogue spoken by "Quanah" near the film's close was actually uttered by the real-life Chief Joseph, a Nez Perce chief who, upon losing his lands and many of his people during a prolonged flight from the U.S. Cavalry, finally surrendered with the words, "From where the sun now stands, I will fight no more forever."
Actor Stacy Harris' name is misspelled "Stacey Harris" in the onscreen credits. Pre-release news items in Hollywood Reporter include Iron Eyes Cody and Marta Moya in the cast, but their appearance in the released film has not been confirmed. A Daily Variety news item noted that Arthur Space, originally cast as "General Eckert" (later listed as "General Nelson A. Miles"), withdrew from the film due to illness, and was replaced by John Litel. Litel, who had already been cast as "Commissioner Ward," was then replaced by Lowell Gilmore. According to a Hollywood Reporter news item, Mexican director Matilde Landeta (1910-1999) was assigned to act as the government's official liaison to the production.