Where can I find this long lost movie?

I'm looking for a movie that I could've swore was called 'Enemy Territory'. From what I remember, it's about a man that is lost or stationed in enemy territory on an alien planet that humans are at war with. The man befriends one of the aliens and the alien is killed or something so the man gets revenge on humans. this movie is from around the 80's and so its been a loooooong time since I've seen it. Thanks in advance!!! It has nothing to do with quake or star trek!