This mission is one of the Balance of Power missions, where you have to choose between Amita and Sabal. Choosing one will lock the other mission from being playable.
To begin this mission, you will have to choose to side with Amita over Sabal, meaning you will not be able to do Amita’s mission afterwards. Sabal wants you to go to a Golden Path camp and help out with the enemy, so your first stop will be Bravo Camp. Once you arrive, approach the marked Golden Path member and you’ll be told to ready your defenses.
You’ll also get a warning about Hunters, a new and dangerous type of enemy. Not only are they silent in their movements and use bows, which hurt a lot, they also remain tagged for a few seconds and can charm animals to attack only their enemies. Anyways, there’s a mounted gun in the area, as well as mines that you can plant and even a crate to refill ammo.
Once the bar at the top of the screen empties, enemies will start attacking, with them all being Hunters. The first batch will come from the south, then some will appear from the west, so keep your eyes peeled. Luckily, you should be able to tell where the Hunters are coming from if you get hit or an arrow zips by your head.
Keep checking those spots until you don’t see anymore, then get off the mounted gun and look around for more. Once they’re all dead, you’ll hit a checkpoint and will be instructed to go to Alpha Camp. Along the way, you’ll run into more Hunters and there will be them and some melee enemies at the camp. When they’re all dead, the mission will end.