[BravoZulu]

My advice for the Eliminate the Rebel Camp mission is to setup along the top road away from default entrance point. Have a nice solid MG aimed at the path used to get down into the camp and a couple of riflemen beside him (to pick off the tricky ones) but well away from the edge of the "cliff". Then move your marksman towards the edge for a shot or two to stir them up then back him away and wait for them to come up to you.

The sound from the MG should keep them storming up the hill and into the killzone. Be sure to use the dead ground of the center of the road to protect your men from shots from the camp, even at night eventually they will get you.

If for whatever reason they stop coming up move your marksman back to the edge for another shot or two or just lob some grenades down towards them. When I went through the last few refused to budge but thankfully it was few enough and they were spread out enough that I could get them in a quick advance. If the bodies pile up too high around the killzone throw some grenades or even the otherwise useless TNT towards them in the hopes of clearing it out. I ran it during the day, but should work at night provided you have a set of NVG’s for your gunner.

It’s kind of a sleazy approach to the mission but it works.

Suggested armament:
1 x FN Minimi with 200rnd box clip if available (cuts down on having to reload during the fight since it's needed to maintain the killzone);
1 x Silenced DMR of your choice;
2ish x accurate rifles or assault rifles to pick off guys your MG can't hit; and
Lots of grenades, because honestly you can't throw enough of these during almost any mission.
See the attachment for a screenshot of the setup
(I might have drawn mortarmen and not riflemen, sorry about that)