El Condor(1970)

You can get killed trying to break through the walls of El Condor...but it's one helluva way to die!

Luke, an escaped convict, and Jaroo, a loner gold prospector, team up with a band of Apache Indians in 19th century Mexico to capture a large, heavily armed fortress for the millions -- or billions -- of dollars in gold that are rumored to be stored within. Written by Brian C. Madsen