Sitting Bull Public shock and outrage at Custer's death and defeat, and the government's knowledge about the remaining Sioux, led them to assign thousands more soldiers to the area. Over the next year, the new American military forces pursued the Lakota, forcing many of the Native Americans to surrender. Sitting Bull refused to surrender and in May 1877 led his band across the border into the North-Western Territory, Canada. He remained in exile for four years near Wood Mountain, refusing a pardon and the chance to return. When crossing the border into Canadian territory, Sitting Bull was met by the Mounties of
Sitting Bull natives joined him for safety in numbers. His leadership had attracted warriors and families, creating an extensive village estimated at more than 10,000 people. Lt. Col. Custer came across this large camp on June 25, 1876. Sitting Bull did not take a direct military role in the ensuing battle; instead he acted as a spiritual leader. A week prior to the attack, he had performed the Sun Dance, in which he fasted and sacrificed over 100 pieces of flesh from his arms. Custer's 7th Cavalry advance party attacked Cheyenne and Lakota tribes at their camp on the Little Big Horn