Historical records show that Anna Brewster, who was born on December 10th, 1844, married James Morgan in 1868 at the urging of her brother Daniel. One month after that, Sioux Indians raided her farm, wounded her husband and took her captive. On their way back to their village, the Sioux traded Anna to a band of Cheyenne Indians who already owned another captured white woman named Sarah White. Anna Brewster Morgan went to live with the Cheyenne and married one of their Chiefs with whom she became pregnant. Roughly one year after her capture, Anna was found by General George Custer. She was returned to her husband, James Morgan. She gave birth to a half-Indian son, Ira, who fell ill and died at age two. The Morgans had a daughter, Mary and two sons, Claud and Glen. Unhappy in her marriage to James, Anna left him and went to live with her brother, Daniel Brewster. After her divorce from James Morgan, Anna lived under a lifelong stigma because of her past with the Cheyenne. Later in life, she was admitted to a mental hospital where she died in 1902. She was buried next to her son Ira.

This film is inspired from the true story of Anna Brewster, born in 1844, kidnapped in 1868 by the Sioux and traded to the Cheyenne. She lived with the Cheyenne for one year until she was found by General George Custer and returned to civilization.