Killdeer Mountain, called "Tachkawute" by the Sioux (Nakota Dialect), is the site of an attack by a military force under General Alfred Sully on several groups of Dakota, Lakota, and Nakota (Sioux) tribes on 28 July 1864. Sully attacked the encampments, which included women and children, with cavalry and cannons. Many of the Sioux escaped across an opening in Killdeer Mountain called "Medicine Hole". Unfortunately, many of the tribe members attacked had not participated in earlier attacks and this action further embittered many of the Northern Plains Indian Tribes, and helped precipitate the Sioux Wars of the 1870s.
Locals told me to be sure to respect the Private Property Signs because the owner DOES enforce them.
Killdeer is a fairly small town of about 750 located in West Central North Dakota. The town was established in 1914 at the end of a branch of the North Pacific Rail Line. The town catered to area ranchers and has a nice historic district with a few buildings of historic and/or architectural interest. I especially liked the wooden building housing the saloon/dancehall.