Act 1: Ashes - 4. Pound it Out
Go to the little structure for ammo and Frags.
Get COG #7 by going to the big crack in the road and following it up to the wall behind the white van.
Go forward to the big sandbag and kill the Drone to the right side, but make sure you are out of range of the Troika. A Grenadier will burst from the closed door to the very right. Grenadiers carry Gnashers (shotguns) and can toss Frags at you; they also tend to rush your position. Take him out and then go into the building through his door. Get out a Frag and go through the rubble in the building until you hear a hole open somewhere. It is in a tiny room to the right of the very center of the building (behind the middle door) and you need to lob a Frag inside; you should get a conformation sign from someone telling you that you hit it. Then mop up and collect the Frags and ammo in that room. Fall into the group.
Man the Troika and get ready for a couple of waves of enemies. You don't have a crosshair, so "zoom" in a bit, fire, and follow the trail of bullets to your enemies. You should be able to tell if you hit. Be sure not to hit your own guys. No sniper. When all is over, follow your team into the door on the right and fight the Grenadier and Drones. You can pick up the Gnasher, but I don't like it so I won't tell you to. Go through the door when it opens.
Follow the pack to the fallen soldier. From above, take out the two Drones in the doorway across the way on the ground. Pick up the ammo to the left of the ledge and go down there to kill one Drone. After the scene, pick up the full- ammo crate and Frags if needed then follow your new teammate.
In the big hall, go to the left and look behind some tomb-like thing for COG #8.
Go to the door and look back to where the COG tag was and be ready to meet the Wretches. Wretches are fast and small, but they only have a little bit of life. Watch the ceilings and you will be fine. Save the ammo til the end. Take out a whole bunch from the first side and then focus all your fire behind you when you hear they are coming. Melee if needed. After, pick up the full-ammo crate and go through the door.
Swap the Hammerburst for the Hammer of Dawn near the corpse. This part is important to cheating the game. Go to the window that is closest to the door and near the corpse. Get right next to the wall and look out the window to get just a peek at the Seeder's legs. Aim the Hammer on the legs and hold down on the Right Trigger until the beam of energy stops. Then do it one more time to kill the beast. Now come outside and focus fire on the enemies across the drawbridge. You can't plug up the hole, but try your best to kill the guys with the Hammer to save ammo. Go across and follow the path.
When you get into the other side of the big hall where you met the Wretches, inch your way into the doorway just enough to get a read on the Seeder in the open. Don't go out the doorway or you will come under attack. It may be hard, but keep the laser sight steady as you eventually get two blasts off; best to do when he is standing still, then aim for his nose area. Then go out and go to the left and ready yourself for a bunch of Wretches and a Drone. After you and your squad handle them, go through the doorway.