Aragorn has asked you to find Forlong, Golasgil, and Hirluin, all presumed to be missing in combat.
'Forlong, Golasgil, and Hirluin all were lost in the tempest of yesterday's combat. What befell them is unknown, though I fear the worst for Forlong, who was last seen charging at full fury towards a line of Sûhalar.
'Please search for them along the wreckage on the Pelennor.'
Search for Golasgil and Hirluin on the after-battle Pelennor.
Forlong lies dying on the after-battle Pelennor.
Blow Forlong's horn to summon Thorongil.
You should talk to Aragorn, who stands by Forlong on the after-battle Pelennor.