Tsavo Highway
Full Contact Safari
Lead The Marines Away From The Base
Finally, some Warthog action. Head through the barracks here and find the two Warthogs. After opening the door leading to the cave beyond, nab the driver's seat in one of the two Warthogs and head out. (One of the Warthogs has a turret in the back for extra firepower, while the other has room for more Marines.)
Pick your Hog and leave the caves, and get used to the glorious feeling of running down enemies. You can kill almost anything by running it over, although you need to be going a certain speed to make lethal contact; if you're going too slow the enemy will simply be rubbed along the ground in front of you.
;)
Eventually you'll find a couple of snipers near an in-construction sniping tower. Run them down and pick up one of their beam rifles from the ground, then get back into the Warthog.
Head through the first few groups of grunts until you reach a squad near a crashed ship; they'll have three turrets set up to hit you, and the Brute here will have a fuel rod gun that'll make quick work of you if it hits. You can run down the turrets by simply hitting them, so do your best to quickly eliminate the threats.
Dam Base
Just beyond the three turrets is a more fortified area, where there are high-powered turrets sitting atop a damn. Before charging in here, park your Warthog on top of the little ridge that leads to the area and hop out. If you sneak forward, some of the enemies will come after you, allowing the turret in your hog to chew them up, but you should sneak forward further and start firing on the emplaced turrets to your right, as well as the snipers on the dam itself. When you've weakened the defenses up a bit, return to the Warthog, hop in, and drive in to the left to avoid the dam and find the path leading behind it. If possible, stop near the dam and exchange your beam rifle for a new one with more ammo.
The Battle of Tsavo Highway
Move through the valley beyond the dam to find another group of Covenent fighting against your troops. If you have a beam rifle, you can move the warthog up over the ridge, where it'll fire on any enemies that come near you, then get out and use the beam rifle to shoot out the turrets and snipers on the far side of the area. If you don't have a rifle, then just proceed slowly with the warthog and use a battle rifle to clear out the turret above you before getting close to it. Your Hog turreteer should be able to engage most of the enemies here and destroy them with minimal damage to yourself or the Warthog, but only if you proceed very slowly and let him or her do their job from maximum range.
;)
After destroying the turret, and the one near the shielded exit, move up to the shield in the truck until you get the audio warning that Drones are incoming, then back away a bit. The Drones will quickly start flooding out of the tunnel, so let your turret gunner take them out. When that's done, get close to the shield and throw a frag grenade towards the generator; that can destroy it from the opposite side of the shield. Alternately, you can head through the shield and destroy it with weapons. When the shield's down, let the turreteer go crazy on the Brutes inside, then proceed through.
Tough Luck Skull
;)
As soon as you exit the tunnel here, you can pick up the Tough Luck skull. Get out into the sunlight, then exit your vehicle and hop onto the building to the left of the tunnel exit, then hop from there onto the pipe beyond it. Walk down a ways until you reach the yellow gate-like thing that blocks you from walking onward. Jump over it, then look downward; you should see a walkway leading out over the chasm. Drop onto it and walk down; you'll see a platform on your right. You can jump across to find the Tough Luck Skull.
