US Civil War is over. Mexico fights Emperor Maximilian. Border warlords wreak havoc along the Rio. Cattle are rustled. Innocents are killed. U.S. girls are stolen across the border. Texas Lawmen won’t go. The U.S. Cavalry can’t go. Jeb & Zach, Civil War vets, wade the Rio Bravo to find a stolen girl-- Jeb’s 14-year-old niece! A border war rages across the Rio with ranches burned. No one is safe. The pair pledge to bring the girl home -- or die trying!