In 1916, a Mexican rebel named Cordoba steals six cannons from the forces of General Pershing who's been sent to bring order to the Texas-Mexico border. Pershing assigns a soldier named Rod Douglas to retrieve the cannons. Douglas recruits a trio of misfits and they, along with a Mexican officer and an enigmatic woman, travel 200 miles south to Cordoba's mountain fortress. Explosions and gun battles soon erupt.