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 the world. Two weeks later, after waiting in vain for other members of his tribe to follow him from Canada, the Army transferred Sitting Bull and his band to Fort Yates, the military post located adjacent to the Standing Rock Agency. This reservation straddles the present-day boundary between North and South Dakota. Sitting Bull and his band of 186 people were kept separate from the other Hunkpapa gathered at the agency. Army officials were concerned that he would stir up trouble among the recently surrendered northern bands. On August 26, 1881, he was visited by census taker William T. Selwyn,