Anyone got a idea
 

On the mission where you have to hold the hill till the helicopter arrives, anyone got any help, not enough health kits, I'm wondering if I should have waited back at camp longer before running to the hill, I took off with 4 min. to go. How do you hold them off

It's been a year since I played this but I know I died a lot. But I just did it several times and finally made it. Just taking my time shooting helped. It seems there's ammo packs or health on that hill. Like I said, it's been about a year.