I may be hallucinating, since I can't find it anywhere, but I seem to remember I played a game (at least 14-15 years ago): you were in control of a soldier inside a trench (I think it was during WWII), you had a set weapons like machinegun, grenades, bazooka, you could even call for an air strike, and you had to kill the soldier in the other trench in front of yours. I remember that both you and your enemy immediately respawned when killed.
Can't remember anything more - If someone knows the game I'm referring to, I'd be delighted.
