This horde is located on the east edge of the map northeast of Sherman’s Camp. It’s also a Nero Research Site close to the farm where you first are introduced to the Screamer Freakers.
If you are doing this mission in the day time the Horde will be inside the cave. There is a group of bushes to the left of the cave entrance that will keep you concealed. Use an attractor to lure the Freakers out and when the first ones appear start throwing Molotov Cocktails. I used 6 Molotovs and 2 grenades, I used grenades because at this point in the game I can buy them as opposed to pipe bombs.
This mission pays 1900 credits, 600 trust points, and the Horde Killer story line will be updated. Taking out this horde brought me to 25% which unlocks the auto shotgun which is still a shotgun so it’s only good a short range but is has a much bigger magazine.
Thanks for watching, God Bless and happy gaming.