This is one of my favorite movies while growing up. Nightmares 1983 but in particular
the segment called Bishop of battle starring Emilio Estevez. Here it is in 3 parts.
This movie is now out of print and almost impossible to find for sale or rent.
So the only place left to watch it is Youtube.
Bishop of Battle part 1
Bishop of Battle part 2
Bishop of Battle part 3
