Call of Duty 4: Modern Warfare/Heat

Objectives

 * Obtain New orders from Captain Price.
 * Take up a defensive position along the ridgeline.
 * Defend the southern hill approach.
 * Fall back and defend the south-western approach.
 * Use the detonators in the tavern to delay the enemy attack.
 * Fall back to the farm to the north
 * Get the Javelin in the barn.
 * Get to the LZ
 * Survive until the helicopter arrives
 * Board the helicopter

Defend the ridgeline
When you are told to get to the bank, instead, head up to the church tower, you will find a lot of RPGs, swap your sniper rifle for these then after you have shot them all, get back our sniper rifle and snipe from the church tower.

Eventually, you will be told to get the mini-gun, do this, it is inside a helicopter. It does not get very hot quickly so take Captain Price's advice and keep it warmed up at all times, the main enemies will come from the left side of the church but occasionally check to the right for a few enemies trying to flank you. When the 5 helicopters arrive, shoo them all with the mini-gun then retreat to the tavern.

In the tavern, there will be 4 C4 detonators which you need to explode, you will see yellow rings to show you where the C4 are, only explode them when enemies will be killed.

Fall back to the farm to the north
After you have detonated the final one, get out of the house using the back exit on the top floor, go left to escape as it is more covered then make your way to the farm. There may be a few enemies in the barn, kill them then get the javelin from the barn, shoot the 3 tanks then get your first weapon back. Now there will be a small shed in-front of you, aim your machine-gun through the window at the doorway, as a lot of enemies come through, you can easily kill them.

After you find out that that have to go back down the hill, go into the shack and go outside, if a patrol is coming, wait near the doorway then kill them all. Some of the troops may have a P90 gun, it is not a good idea to pick this up as it does not have the range needed to get any enemies in the mission. Crawl through the pipe in the field then go to the right of the house with the dead cows outside. After this, go down the hill and try to get to the tavern that you were in before, after you get there, use this to heal and reload. If there are enemies outside, use an air strike to sort them out then continue down, get to another building down the hill, then go to the right, there should be a small gap between the railing and the fence, there will be a lot of enemies after this point, you can either run past them all to the LZ, or you can snipe them off from the position, afterwards, go into the building and wait for the helicopter, you may or may not have a few enemies trying to move into the building, if you do just kill them. Wait for the helicopter then get on board, possible shoot some enemies if they have not been delat with then the mission will end.