Watch The Great Sioux Massacre (1965) (1965) HD Full Movie Free on SolarMovie. Watch The Great Sioux Massacre (1965) (1965) online free. A somewhat different take on Custer's motivation that changed him from a defender of Native-American...A somewhat different take on Custer's motivation that changed him from a defender of Native-American rights into a politically-driven, headline-seeker chastiser of the Sioux during the 1870s.