Gárnoth's Farm was one of the more productive farms in the Fallows, but was recently abandoned. Cyneberg scouted the farm and saw many Orcs carrying arrows, and with Forlaw's defenders running low on supplies, this would be a good opportunity to help secure the area and resupply the guards.
There are many White Hand troops occupying this farm. These troops are in a prime location to assault Forlaw and are a threat to anyone on the plains of the Fallows.
While here, you should reduce the number of troops the White Hand have stationed here. In the last two assaults on Forlaw the guards have used a fair amount of their arrow supply. It would greatly benefit Forlaw if you collect their arrows to help resupply Forlaw's defences.
Gárnoth's Farm is to the south of Forlaw. A little down the road past the south gate of Forlaw is a path to the right that leads to this farm.
Orcs seem to have recently captured Gárnoth's Farm. Most of the Orcs appear to carry arrows on them, and collecting arrows for Forlaw's defences should be a priority.
Cyneberg is keeping Gárwig company in Lornsettle, the mead hall of Forlaw.