Will Hansen (Chuck Connors), Ike (Aron Kincaid), Hank (Henry Caps), Jeb (Smokey Robards), and Billy (Peter Ford) have just emigrated from their home state of Texas to Colombia in South America.

After their arrival, they are ambushed by Colombian soldiers who force them to come meet General Martinez, the evil, cold-hearted dictator of their country.

Mila rides back to town to get Will's friends, who give him a funeral, and vow to avenge his murder.

They later ambush Martinez and the rest of his surviving soldiers in a canyon, joined by the rebel army's captain.

With a working title of The Proud, Damned and Dead, the production was filmed in 1969 in Villa de Leyva, Colombia.

In addition to the film's main stars, three smaller roles were filled by actors who would later appear in The Day of the Wolves: Andres Marquis, Smokey Roberds and Henry Capps.