Gothmog's forces are scattered throughout the area. Dolenthol asked you to seek out and defeat both scouts and defenders.
'The forces arrayed against us will make it difficult for the Rangers to explore further into Minas Morgul. We must thin the ranks of Gothmog's scouts and defenders if we are to have success in this. Will you see it done?'
Gothmog's scouts and defenders are patrolling the area and must be defeated.
You should defeat Orc scouts and defenders.
You thinned the ranks of Gothmog's forces in the area.
You should return to Dolenthol and inform him of your success.