Jet contrails
Where was this filmed? Next to Tucson Airport?
Couldn't they have at least changed the camera angles a bit so that the jet contrails were not so visible in the sky? Probably the made-for-TV-but-then-released-in-theaters low budget prevented them filming more than one take per scene.
In the scene where Lee van Cleef meets Ralph Waite and his motly group of village defenders, and the padre offers them "lemonade," you can see streaks in the sky obviously made from passenger or military jets. Or, maybe they were just 19th century UFOs.
What a piece of low-budget crap, with a slight rip off from "The Dirty Dozen." Actualy, this western started out OK, but then it went right in the toilet when the awful cast of unknown actors playing the "prisoners" very inplausibly are released from prison and given an opportunity for pardon.
Junk. Too bad, because it started out somewhat interesting.