Gouverneur K. Warren
The mountain was named Harney Peak in 1855 by American Lieutenant Gouverneur K. Warren in honor of US General William S. Harney, his commander in a regional military expedition. In punitive retaliation for other Sioux raids, in September 1855 Harney's forces killed Brulé Sioux warriors, women and children in what Americans called the Battle of Blue Water Creek in Garden County, Nebraska.