In October 1913, Bierce, then age 71, departed from Washington, D.C., for a tour of his old Civil War battlefields. According to some reports, by December he had passed through Louisiana and Texas, crossing by way of El Paso into Mexico, which was in the throes of revolution. In Ciudad Juárez he joined Pancho Villa's army as an observer, and in that role he witnessed the Battle of Tierra Blanca.