Uncharted: Drake's Fortune

Keep the Dragon until you have taken out the two snipers. I took the circular cover that is opposite of Sullivan's. The next wave (Sniper in tower and grenade in window) I went to Sullivan's cover and moved all the way to the left with an M4 or Shotgun and took out the two guys trying to flank me. Sullivan should take out the guys on his side but you can help him out.

For the first part of the fight, I would sneak down the tunnel until I could shoot the guys on the right, then I would wait a bit until people started coming down from the left, took a few quick shots, then ran back into the tunnel, then just waited to the left of the stairs with a shotgun until someone decided to follow me into the tunnel. For the second part, quick, precise sniper shots for the people in front, then whip around with something more close range for the irksome shotgunner or two.

Did you have the dragon sniper before getting there, or when you go there? If you had another weapon first, kill the two guys who are there when you come in, grab the rifle, then kill the sniper in front of you. Some guys will spawn, and you'll want to take out any enemies with rocket launchers or shotguns IMMEDIATELY. Because they spread out and also attack Sully, it should be easy enough to kind of run towards them while firing, especially if you have picked up your shotgun after taking out the sniper. After you've taken care of them, you'll want to pick up a sniper again and take out the other sniper, then a wave will come in from the north (from the entry point) i believe there are two guys with rocket launchers among them - you want them to die. Like someone above said, the circular thing is great because you can move around it and easily have cover from rocket launchers. The most important thing is to just move a lot and not sit still, contrary to most of the game's fights.

I basically sniped the snipers and the guys with the grenade launchers, then took the M4 from someone I killed with the pistol and went back behind cover. It's important to watch you back, though... I had to kill some guys trying to flank me (blindfiring at them is effective because you don't poke your head up).

When you start this checkpoint you arrive behind the two guys pinning Sullivan down. Kill them, then head back to where you started the checkpoint. You will have a wave of enemies come in from your left and they will funnel down the hallway to the courtyard. You should be able to kill all at once as they run down that hallway towards you.

Next you run out to where Sullivan is hiding, quickly kill the sniper to your left, and the next wave of enemies should approach from the area that you just ran out of - if you kill the m79 mercenary in that wave, the rest should be easy pickings. If you're quick, you should be able to kill most of them as they are running out of that hallway.