Follow Price and Soap up to the edge of the road and crouch down as instructed. Wait for the convoy to move past and then follow the pair further to the left. You'll be warned about a couple of enemies up ahead. One of them will be carrying a body and will be easily noticed while the other is back a little ways. Shoot the first one and you'll probably see the second one running away. Be sure to take him out as quickly as possible.
Move through the blown out building and you'll see a group of people in a field beyond. There are four people here to kill but they are hard to tell because they are all wearing the same clothes. Aim for the one with the gas tank and the man shooting the gun into the air first and then you'll find the other two quickly enough when they open fire on you.
Just follow Price's instructions for a little while. Wait for him to tell you what to do and do it promptly. You will continue to do this until you come toe point where you're told to split up. Go up the ladder to get a good vantage point and knife the enemy in the chair. You need to provide sniper cover from here.
The first group of two will walk directly toward you and past Soap and Price. Take them out and then two more will appear from left and up. These two will approach Soap and Price's position. Take them out and three more enemies will appear up the road a little ways. It might be easier to see them if you zoom out. Kill them and drop down. Follow in their tracks but when you get to where those three men appeared, watch for two more to appear from the left. Kill them and turn left to regroup with Price and Soap.
You'll have to make your way up an alley way. If you're quick, you should be able to take a good portion of the enemies out before they can find cover. Thebes cover is on the right side though so move up the right and clear enemies. When you get close to the end of the alley, Soap will open a door to the right and go up a ladder.
At the top of the ladder, walk forward, drop down and take cover there. Kill a few men and a truck will show up with a turret. Take out the turret quickly and then turn right. Start taking out the enemies at the end of the alley. Toss a grenade at the truck and hopefully thin the group. Hop up on the turret closest to you and start shooting... everywhere. There will be enemies on the building straight ahead and to the right. Some enemies will flank you on the left and another truck will come down the road right in front of you. BOOM!
Get up and follow Soap. Keep running and the floor will fall through on you again. Soon as you can, shoot because you'll be charged by a man with a machete. Kill him and head up the hill a little bit. You'll kill two more men and regroup with Price. Follow him for a minute and then head up some stairs to the mortar position
Get on the mortar and start shelling the village area below. Make sure you takeout the trucks that keep coming at you. As long as you get close to the target, it will count. Just keep shooting and eventually you'll have to follow Price off the back side of the tower. You'll go through a sewer and come out to some gun fire. Kill the men by the house slightly to your right.
Go around the corner and take out the three men on the roof in the distance. You'll head into a building on the left but stay outside because there isn't really any good cover inside. Clear that out, run inside and then run back out the other door. Watch for enemies on the second floor of each of the two buildings in front of you. Head up the alley to the right and then follow Soap through the building and you'll come into a marketplace. Watch high on the left and right side. Push forward and on the far side you'll come to the church.
Go inside the church and you'll be greeted by a good number of enemies. Just let loose because they'll end up taking cover behind the benches which don 'tactual provide any protection. **At the far end of the church, you'll find an Intel on a desk. Stack up and breach the door on the left side of the church. You'll be attacked by a dog but your real focus will be on shooting the enemies behind the dog. Shoot both and then you'll shoot the dog.