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 Concho Rivers, situated on the Butterfield Overland Mail Route and Goodnight–Loving Trail. The US Army operated the fort for twenty-two years, from November 1867 to June 1889, and in that time the fort housed elements of fifteen US Cavalry and Infantry regiments. Initially, Fort Concho was the principal base of the 4th Cavalry and then between 1875 and 1882, the "Buffalo Soldiers" of the 10th Cavalry. The troops stationed at Fort Concho participated in Ranald S. Mackenzie's 1872 summer campaign, the Red River War in 1874, and the Victorio Campaign of 1879–1880.