Continue carefully across the bridge, as there are more enemies here. If you screw up and wake them up, kill them normally. There are several Grunts asleep here, so melee them to death. After several more twists and turns, you will come to another door. If its pointing away from it, don't enter.

If it has a glowing arrow-like thing on pointing towards it, go in. Move around the place until you come to another door. Don't kill all of them (unless you are on a higher difficulty), you'll need your ammo later. There are quite a few Jackals and some Grunts in here as well. As soon as he hits the floor, continue onward to the right. When you get to the next door, be careful. Be careful, there are still some Grunts inside. After killing them all, grab any plasma weapons that you fancy (if you fancy them that is) and head for the door. If they get out of your range of fire, get out and finish them off with your Assault Rife or Pistol. There's an Elite in there as well, so watch yourself. As soon as the door opens, start blasting the Covenant that come out. Quickly run to the nearest gun turret and get in. The first thing you see when Foehammer drops you off is a Grunt running into a door.

Halo ce assault on the control room