Seeking to avoid confrontation with the Sioux, who were natives of the Council Bluffs area, the 1,000 to 2,000 Pottawattamie initially had settled east of the Missouri River in Indian territory between Leavenworth, Kansas and St. Joseph, Missouri. When this area was bought from Ioway, Sac and Fox tribes in the Platte Purchase and part of Missouri in 1837, Sauganash and the Pottawatomi were forced to move to their assigned reservation in Council Bluffs. Sauganash's English name was Billy Caldwell, and his village was called Caldwell's Camp. The tribe were sometimes called the Bluff Indians. U.S. Army Dragoons built a small fort nearby.