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 (film) court-martialed again, stripped of his rank, and sentenced to death by firing squad for treason. As the execution is about to take place, Sitting Bull comes to the fort to speak with President Grant. Parrish had told him "the Great Chief will understand," believing he would show mercy to him because his only intention was to prevent more killing. Sitting Bull's pleas with Grant to spare his life. Grant then commutes his sentence to being discharged from the service. It was first announced that Boris Karloff would play the title role, but J. Carrol Naish ended up repeating his role