Shoot away and then get the turret to blast whoever remains. Work your way along the platforms. There are 1-2-3 on one wall. Move along the outer hallway area to the next area.

Now you get more ships to deal with including wraiths. This room has a half dome on the left hand side. They are pretty nasty and ram you if you're not careful.

Move down into the door and to a waterfall area. checkpoint

You get the music up and are in a big city area with lots of guys running around and shooting. There are ghosts and warthogs zooming around. Help out as best you can. Cool cars are there :) Those warthog drivers are a little out of control.

Head to the right. "There are a number of marines trapped in that building" says cortana. She says to concentrate on the wraiths. Those are the tankish ground units. Shoot through them with a ghost. When you do, Cortana says "there is a marine command post in that building. We'll need to help them with that Scarab."

Perez shows up to guide you. Go on up the stairs.

Halo 2 Walkthrough

Halo 3 Walkthrough