In the beginning, go back and cross the 'crater' in the ground, and look around the tank to find the most powerful machine-gun in the game. You can also find a health, more sniper guns, and Mark 2 grenades. Then between the first and second implated cars surrounded by the nazis the is a sniper gun, the G43, which can snipe about 1/4 the way down the bridge. The exact location varies. When you get to the end of the bridge, wait for the two gunners on each side to stop and reload, and one shot at a time, don't get greedy and try to kill them in one shot. Once you get into the tower on the left, go right up to the top of the stairs where you can find four packs of grenades, and two health packs. Best of luck, this may take you a few tries, I know it did for me, but keep trying. P.S. Try to save ammo from the gun you get at the beginning of the mission for when you have to single-handedly storm the south tower.