Fort Assinniboine was a military outpost established by the United States Army in 1879, located near the confluence of the Milk River and the Missouri River in Montana. It served as a strategic base for the protection of settlers and the facilitation of trade in the region. The fort was named after the Assiniboine people, a Native American tribe that inhabited the area. The fort played a significant role during the Indian Wars and was active until 1911. Today, Fort Assinniboine is recognized for its historical importance and is a site for archaeological studies, reflecting the interactions between the U.S. Army and various Indigenous groups, including the Assiniboine and Sioux.