In this limp western melodrama, when Mexican bandit Hector Cordoba (Raf Vallone) attacks a U.S. Army fort a few miles from the Mexican border, General John Pershing (John Russell) orders Captain Rod Douglas (George Peppard) to organize a group of soldiers to cross the border into Mexico to capture Cordoba and to bring him back to the U.S. for trial. When Douglas's band cross into Mexico, Douglas meets Leonora (Giovanna Ralli), a beautiful Mexican woman raped by Cordoba, who agrees to lead the Americans to Cordoba's stronghold. But Leonora is not entirely trustworthy, and when the Americans reach the fort, Cordoba takes them prisoners. Now, the Americans must escape from Cordoba's clutches and make it back to the other side of the border.