The Second Battle of Agua Prieta, 1 November 1915, was fought between the forces of Pancho Villa and those of the future President of Mexico, Plutarco ElĂas Calles, a supporter of Venustiano Carranza,
In mid 1915, the administration of Woodrow Wilson switched from backing Pancho Villa to supporting his opponent, Venustiano Carranza. Villa believed that help rendered by the United States to Carranza at Agua Prieta was the major factor in his defeat.