[3] The Eastern Shoshone primarily settled on the Wind River Indian Reservation in Wyoming, after their leader, Washakie signed the Fort Bridger Treaty in 1868.

[4] The Eastern Shoshone adopted horses much sooner than their neighbours to the North, the Blackfoot Confederacy (made up of three related groups, the Piegan, Siksika, and Kainai).

With the advantages that horses provided in battle, such as speed and mobility, the Eastern Shoshone were able to expand to the north and soon occupied much of present-day southern and central Alberta, most of Montana, and parts of Wyoming, and raided the Blackfoot frequently.

Once the Piegan, in particular, had access to horses of their own and guns obtained from the Hudson's Bay Company via the Cree and Assiniboine, the situation changed.

This lawsuit argued by George Tunison ruled that the Shoshone were owed payment for the location of the Northern Arapaho to the Wind River Indian Reservation.