The movie's portrayal of the Battle of Washita River as a Custer-led massacre of women and children (which Penn compares to the Holocaust) is not entirely accurate as the camp was partially occupied by tribal warriors . The film, however, is consistent with historical records of other encounters between Indians and the U.S. Cavalry; the Cavalry's common tactic was to wait until the warriors had left the camp to hunt, or to lure the warriors away with assurances of good hunting, and then to attack the unprotected village. The two massacre scenes are historically reversed, the Sand Creek massacre occurring first in 1864, where Colorado militia (not including Custer) attacked a peaceful contingent of Native Americans, killing more than 150 women, children and elderly men. (The Sand Creek Massacre was depicted in another 1970 Western, "Soldier Blue".) The Custer-led raid on the Washita occurred in 1868.