Wilferth thinks the Orcs and Uruks may have different reasons for being in the East Wall, but he knows that they are all your enemies, and an advantage to any one of them is a problem for your friends.
'They may not be working together, ${PLAYER}, but the various tribes of Orcs and Uruks here in the East Wall are each our enemies. Is it possible for them to set aside their differences and work together, as Men do? I am afraid it is. We must oppose them all, wherever we can.
'During the Orc-ambush that greeted us shortly after our arrival here, I saw an Orc from Mordor carrying a high-quality sword. It was not of Orc-make; their weapons are crude and ugly, but this blade caught the light and seemed to shine as the Orc swung it around him in deadly arcs.
'It is not right for such a weapon to languish in the hands of an Orc. I did not see this Orc after the battle, so he must have escaped into the East Wall somewhere. Find him and take the sword from him, ${PLAYER}. Many of the retreating Orcs fled to the north-east. Begin your search there, at the camp the Mordor Orcs have established between here and the Wold.'
The Orc with the unusually high-quality sword fled after the raid to the north-east and is probably within the camp the Mordor Orcs have established between Mansig's encampment and the Wold.
Wilferth saw an Orc wielding a sword well above its station and wants you to reclaim it.
Wilferth is at the Rohirrim-camp in the East Wall.
You have recovered the stolen sword and should return with it to Wilferth so he can see it.