Fell Folk of Umbar
The Flame of the West#39 (x2)

When Revealed: Either return each Corsair enemy engaged with you to the staging area, or discard cards from the top of the encounter deck until a Corsair enemy is discarded and put that enemy into play engaged with you.

"...there men of Lamedon contested the fords with fell folk of Umbar and Harad who had sailed up the river."
-Legolas, The Return of the King