This mission is absolutely terrible and my advice is to do as little as possible. Just focus on moving from cover to cover and don't shoot unless you are prompted or are confronted with a "shoot or die" scenario such as the guy came around the corner and is looking right at you.
Head down the hill with your squad and when you get close to the walls, you'll find a mortar set up. Go over and use it, then move over the wall. You'll end up moving into a canal. Move through the canal and head up the stairs to get to an objective. This is where my advice comes in. If it feels like you die some cheap deaths here, don't worry, you aren't alone.
At this point, you'll be told to take out the MG nests. Don't bother. Move up to the wall under the nest (though not directly under) and just wait for your squad to kill it. The same goes for the next nest too. Continue along this wall until you reach a point where the wall meets another partial wall. Just sit in the corner and wait until the nest is destroyed. Wait a little longer and then carefully come around the corner of the destroyed wall. There may be one or two enemies here so be careful taking them out. Then follow the wall along to the next corner. Once you are ready, follow the wall all the way to some rocks and then move around the rocks. You'll now be in the MG nest.
Go prone here so you are safe behind the sand bags. You want to try and make your way left and up the hill. If you can get up there and go prone, you can try and just crawl along the wall to the end. This seemed far more effective than trying to fight your way through the endless enemies. Follow the wall until you're told to meet up with your squad just above where you are. Climb the stairs and meet up with them.
Enter the burning building (checkpoint!) and move through the building. You should only meet minimal resistance. When you get back outside, hop in the Humvee and take a ride. You'll eventually come to a roadblock. Get out and remove the obstruction. Watch out for the RPG and then take cover. You'll be told to follow someone as you go up the side of the bridge, under it using a catwalk and flank the enemy. Once you can see them, you can start shooting if you like but your buddy will still be able to take them out himself.
Move further along and you'll come to a trench in the road. Stay in that trench to avoid the tank. Keep running along this trench until you get out to a street by the bank. Your squad will move off to the left and the tank will come back but some air support will take the tank out for you before he takes you out. Cross the street and move up some steps but only part way. Wait for your squad to eliminate the enemies here and then grab the javelin on the roof. Use this to take out the enemy tanks in the area. Once you've cleared the area of the numerous tanks, you'll head over to the bank.
Be careful approaching the bank because there will be lots of enemies shooting at you. You want to move along the left side of the bank with one of your squad mates. Keep moving, climb over a wall and give your buddy a boost up to a ladder. Climb the ladder and jump over to the window to get inside the bank. Inside the bathroom, you'll be confronted with another QTE. Eliminate this guy and move to the next room. Knife the enemy here. He will take no notice of you. I dropped a grenade in this room by accident once and he didn't even flinch.
Knife him and immediately take cover to your right. Kill the few enemies at the end of the walk way and then move alone the short wall to the left. Once you get to the corner, go prone in the little round spot and take cover here. Wait until most of the enemies are dead and just watch across the open section. On the far side you should see an enemy who keeps respawning a room and running out. Kill him and move your way up. Keep an eye on him in case he respawns again but once you get close, he'll stop. Continue around this walkway until you can head down some stairs to the left. Support your squad here and clear the lower area.
You'll regroup under where you are now and head down towards the vault. You'll have to repel down an elevator shaft. Kill the people here and watch for enemies at the far side of this room. Take your time or even let your squad do the work and then proceed to the end of the room. You'll have to help you squad open a big chest (it takes three of you). Once you've done so, the mission ends.
