Fort Concho is a former United States Army installation and National Historic Landmark District located in San Angelo, Texas. It was established in November 1867 at the confluence of the North and South Concho Rivers, on the routes of the Butterfield Overland Mail Route and Goodnight–Loving Trail, and was an active military base for the next 22 years. Fort Concho was the principal base of the 4th Cavalry from 1867 to 1875 and then the "Buffalo Soldiers" of the 10th Cavalry from 1875 to 1882. The troops stationed at Fort Concho participated in Ranald S. Mackenzie's 1872 campaign, the Red River War in 1874, and the Victorio Campaign of 1879–1880.