I have gone through the campaign and am at the end of Pillar of Autumn (Mission 10). I have gotten to the big anti-aircraft gun and am supposed to shoot the enemy ships so the ally ship carrying the Cortana package can fly safely away. Here is my problem. I have gotten into the big gun but there is one red elite on a level below the deck with the gun. I shoot and shoot the phantoms and banshees but I always get shot in the end. Each time I shoot up to 7 or 9 of them, but I die. I do not believe the elite below has any way of shooting me but I do hear him grunting as I die. Does anyone know whether the game will refuse to let me win this battle without killing that guy? I do not have any weapon of sufficient power to kill him. All I have is a DMR and an assault rifle, both with little ammo. Neither has any effect on the guy. Once I managed to weaken him, then whack him with my arm. He died, but, by then, the phantoms were thick all over the place and I could not get into the big gun at all. I hate to think I've gone this far and can't finish the campaign because he lives. Do I need to restart the mission to try to get a stronger weapon so I can kill every creature on the ground before the game will allow me to finish? I know that some things can never be accomplished before certain prerequisites (like having to kill every enemy in an area before the allies will open a door, etc.) If anyone knows what I need to do to beat this part of the mission, could you please tell me. I feeling pretty hopeless about this.