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 with the Blackfeet Nation and Crowfoot. As an advocate for peace himself, Crowfoot eagerly accepted the tobacco peace offering. Sitting Bull was so impressed by Crowfoot that he named one of his sons after him. Sitting Bull and his people stayed in Canada for 4 years. Due to the smaller size of the buffalo herds in Canada, Sitting Bull and his men found it difficult to find enough food to feed his people, who were starving and exhausted. Sitting Bull's presence in the country led to increased tensions between the Canadian and the United States governments. Before Sitting Bull left