Just beyond the raptors, use your entrencher to burrow under the wall ahead. Inside, take out an enemy, then head up the stairs on the right. There're more enemies ahead. Use B melee them when nearby. Make your way toward the doorway ahead. Use your entrencher to destroy the enemy antiaircraft gun in the next area. When it's gone, follow your marker toward the next bunker. Watch out for a heavy enemy presence here. Get into the bunker through the gap in its wall. Then fight your way through the bunker, toward the next gun. Watch out, it's guarded by a raptor. Destroy the second gun as you did the first. Then follow your marker back through the bunker.
Outside again, battle more enemies as you go. When you come to the spike supporting the bridge overhead, destroy the spike to lower the bridge. Then fight your way forward, taking out the raptors in your way. Angle around to the right, and climb the hill there. From there, you should be able to run across the bridge toward your destination. After the friendly ship arrives, pick up the spike grenades from the crate that drops off, then battle the large group of enemies ahead. Watch out for the machine gun turret straight ahead. By raising a hill and jumping over the wall on the right, you should be able to get around and flank it.
Fight your way through the bunker, and use a spike grenade beneath the grating in order to open it. Then drop down. After your allies are killed, continue on by yourself. You have no chance to create your own cover inside, so use whatever's available, and go slowly and carefully. There are plenty of enemies waiting for you ahead.
Up ahead, lower the ground in front of the doorway in order to proceed. There are plenty more enemies in the next room. Fight your way through them, and create a hill for yourself at the end of the area to reach the walkway above. Then raise the ground beneath the containers below to create a series of stepping stones for yourself. Jump across the walkway on the far side of the room.
Follow your marker through the next doorway. In the next room, look through the opening on the left, and throw a spike grenade beneath the shield generator on the wall on the right in the next room. This should knock it out, taking out the shield and allowing you to destroy the objects in the next room. After the explosion, head outside, and find the rocket launcher there. Use it to destroy the enemy dropship before it escapes. Watch out for its powerful machine gun. You may want to create some cover for yourself in this area. Try to remain in the area of the supply crate, as you'll probably need to restock on ammo before the dropship falls.
When it's down, use the rocket launcher to take out the hydras up ahead. These dangerous, fast-moving enemies can be tough. They jump around a lot, so you may need to fire several rockets at each in order to pin them down. The hydras fire rockets of their own, so don't get too far from good cover. Once they're down, head up the hill ahead, and battle some raptors and lesser enemies. Get on the elevator at the top of the hill, triggering a cut-scene and ending the mission.
