The Scourge are trying to form a base at the Agamand Mills. If they do, then they can stage further attacks within Tirisfal. The orders have been given. The Scourge in the Mills must be destroyed. Go to the Mills. Collect Notched Ribs from Rattlecage and Cracked Skull Soldiers, and Blackened Skulls from Darkeye Bonecasters. To get to the Mills, follow the road west. After crossing the bridge, take the next fork north then keep going north. When you see windmills, the battle will begin.