The Woodmen believe that the Easterlings in the Rushgore are descended from the tribe which Eorl the Young had aided Gondor against at the Field of Celebrant and are the precursor of another major invasion.
'${PLAYER}, if these Khundolar are indeed descended from our foes of old and that they are but the precursor of an invasion, their main force will likely come down through the Brown Lands from the passes in the east. We have a watchpost there which may be threatened.
'Would you go to Etheburg in the Brown Lands and warn Céola? Our men there must not be taken unawares.'
Céola is at Etheburg in the Brown Lands, south-east of Aculf's camp.
Aculf asked you to warn Céola, the commander of the border-guard in the Brown Lands, of the Khundolar's impending invasion.