Between 1876 and 1877, the U.S. Army battled Lakota Sioux and Northern Cheyenne Indians in a series of vicious conflicts known today as the Great Sioux War. After the defeat of Custer at the Little Big Horn in June 1876, the army responded to its stunning loss by pouring fresh troops and resources into the war effort. In the end, the U.S. Army prevailed, but at a significant cost. In this unique contribution to American western history, Paul L. Hedren examines the war’s effects on the culture, environment, and geography of the northern Great Plains, their Native inhabitants, and the Anglo-American invaders.