I am at the level where I have the sniper rifle and I'm protecting Carlos. I kill all the guys(tower, 3 @ fire, etc.) when I tell Carlos to go to the gate he dies near the fire that the 3 guards were. how do I get him past that?

Try the following link, section 17. Within the Walls.

http://www.gamefaqs.com/console/xbox360/file/934403/51517

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Cheaper, cleaner & less likely to find p*ss in your drinks...

Thanks...I was missing the first guard tower.