In 1916, Congress authorized establishment of a reservation for the Chippewa, who had been supported in their quest by prominent whites in Montana. The government ceded a portion of Fort Assinniboine to the Rocky Boy Indian Reservation, established for the Chippewa band led by Chief Ahsiniwiin (Rocky Boy, or Stone Child.) He had died several months before the reservation was authorized by Congress, and it was eventually named in his honor. It is the smallest reservation in the state in terms of land area, with a total land area of , which includes extensive off-reservation trust lands. (Some lands were added after the initial authorization.)