The Battle of Guerrero, or the Battle of San Geronimo, in March 1916, was the first military engagement between the rebels of Pancho Villa and the United States during the Mexican Expedition. After a long ride, elements of the American 7th Cavalry Regiment encountered a large force of Villistas at the town of Guerrero in the Mexican state of Chihuahua. In what was called the "last true cavalry charge," the Americans assaulted the town and routed the defenders, inflicting over seventy-five casualties on the Mexicans with the loss of only five men wounded.