The Kiowa Apache and Kiowa had migrated into the Southern Plains sometime around 1800. By the Treaty of Medicine Lodge in 1867 the Kiowa and Kiowa Apache settled in Western Oklahoma and Kansas. They were forced to move south of the Washita River to the Red River and Western Oklahoma with the Comanche and the Kiowa. The reservation period lasted from 1868 to 1906. The transition from the free life of Plains people to a restricted life of the reservation was more difficult for some families than others. The 1890 Census showed 1,598 Comanche at the Fort Sill reservation, which they shared with 1,140 Kiowa and 326 Kiowa Apache.