Sitting Bull did not agree to the treaty. He told the Jesuit missionary, Pierre Jean De Smet, who sought him out on behalf of the government: "I wish all to know that I do not propose to sell any part of my country." He continued his hit-and-run attacks on forts in the upper Missouri area throughout the late 1860s and early 1870s. The events of 1866–1868 mark a historically debated period of Sitting Bull's life. According to historian Stanley Vestal, who conducted interviews with surviving Hunkpapa in 1930, Sitting Bull was made "Supreme Chief of the whole Sioux Nation" at this time.
Sitting Bull north to Wood Mountain, North-Western Territory (now Saskatchewan). He remained there until 1881, at which time he and most of his band returned to US territory and surrendered to U.S. forces. After working as a performer with "Buffalo Bill's Wild West" show, Sitting Bull returned to the Standing Rock Agency in South Dakota. Because of fears that he would use his influence to support the Ghost Dance movement, Indian Service agent James McLaughlin at Fort Yates ordered his arrest. During an ensuing struggle between Sitting Bull's followers and the agency police, Sitting Bull was shot in the side and head