I am playing the game on veteran, and its the last of the desert missions ( the 3rd british mission ) I am not sure the name of it off the top of my head, but in the mission you are going back into this city to retake it. When you start you are in a jeep and you get ambushed, then you have to wait for a gate to be opened to progress. That took me all of 100 times to get through, then another 100 tries to pass the next part, eventually you come to this square that has a anti aircraft gun in the middle. You have to kill "jerries" on the roofs of the square, and then you have to run out to the gun and shoot down an airplane coming.
Well I got a checkpoint just as the get to the aircraft gun message came up. If I run straight to the gun the "jerries" on the roof take me out VERY FAST ( i usually cant make it to the gun ) and if I take the time to kill the people on the roof, a plane bombs the place and ends the mission. I have tried this well over 200 times and I cannot pass this point. Can anyone help me please!!