Two guys team up to break into a Mexican fort and steal or swindle, or maybe just ask for the vast treasure of Gold bars. Turns out to be a difficult task, considering they also have to defeat a large mexican army garrison. With the help of a band of Apache's, they have to clime impressive walls, dodge canon fire, survive the desert sun, shoot a lot of naked soldiers, and try not to look at the Commanders naked wife.

It is a Hollyywood production, filmed in Almira Spain, which gives it the look of a Spaghetti Western. The impressive El Condor adobe fortress was made from scratch for this film - and was used in other later movies.

Check out my list: https://trakt.tv/users/jeffsmith99/lists/spaghetti-westerns-i-want-to-watch

This movie is available to rent from various streaming sources, but finding iit online for free may be a challenge.