Killzone 3 Walkthrough - Pyrrhus Evac: Part 4
4Full Walkthrough: http://www.gamefront.com/killzone-3-walkthrough/
With Rico gone, you're alone (for the most part) in this next section of trenches. Just at the corner ahead of you, above your position, is a Helghast flamethrower unit. Drop him from a distance if you can, then move to the corner but stay back.
Helghast infantry are set up to stop you just around the corner. Clear them out from safety, if you can. They have shotguns, so be careful.
You might want to swap your assault rifle for one of those shotguns. Move up and watch the right as you enter a more open section of the tunnel — there's another flamethrower trooper up there. Drop him, then turn your attention back to the trench ahead for more guys to blast.
Move up with the ISA soldiers that just joined you. You'll see a blasted-out car on the right and Helghast set up near and behind it. Take cover and start knocking them out, but don't move up past the blasted vehicle.
When you get up a little further, more Helghast troops enter the area from just ahead of you. They'll drop in from the left side wall, so if you go up too far, you'll get flanked. You can do flanking of your own by pushing down to the cover position way down on the right.
Just a little further, you'll clear out a few more guys as ISA troops meet you from the other side of an APC. Once the way is clear, you'll be able to head straight up a staircase and start another cutscene.
Full Walkthrough: http://www.gamefront.com/killzone-3-walkthrough/