Another little strategy:
If you're republic...spawn as a jet trooper and fly to the top of the cave opening. From there you can "walk" up to the top of the mountain. (It's a long and arduous process, and if you don't take the right path you can slide back down the mountain.) At the top there's a little lip you can crouch behind and rain down pistol fire into the CIS main base. And an EMP or two, of course.