 The United States Army, with 600 troops under the command of William Selby Harney, made a surprise punitive attack on a Brule Sioux encampment led by Chief Little Thunder, in retaliation for the Grattan incident.Army infantry and cavalry killed a total of 86 people, including women and children, and taking another 70 women and children as captives.Samuel P. Delatour arrived in the area in 1884, founding a ranch at Blue Creek.