Turgon is concerned about Haradrim forces that have taken the nearby Hillock and wishes to drive them off the best vantage point on Pelennor Fields.
'The enemy has captured the best vantage point on the Pelennor -- the Hillock.
'Haradrim have turned the hill into a mighty encampment. I suspect they will use the vantage point to command troops in battle.
'Please go to the Hillock and defeat enemies there to disrupt their plans.'
The Hillock can be found in Pelennor Fields, north-east of the South-gate.
You should defeat enemies upon the Hillock.
Turgon can be found at the South-gate of the Rammas.
You should speak with Turgon.