July 3, 1915, Mexico. The Revolution advances. Mexican government troops corner the militiamen in the north of the country, who move in and out of Texas to avoid the military. White Texans are tired of these internments. A revolutionary colonel leaves the United States crossing the Rio Bravo with thirty militiamen, after creating disorder and death on the other side of the border. The Texans, assembled at Eagle Pass, set out to track down Colonel Salustiano Matanza.