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Hithlim
Ongburz Iron-fist
Ongburz Rock-heaver
Dol Dinen
Esteldin
Bestowal
'I had never seen a troll until the Orkish siege-weapons rolled past us in the night. Enormous mounds of stone-coloured flesh pulled the siege-towers, catapults, and other terrible machines south towards Dol Dinen.
'I dared not attack them, not without greater numbers. Since then, I have struggled to convince Halbarad that something must be done about the trolls in Dol Dinen, but he would not permit us to risk ourselves. With the aid of yourself and others like you, he has now relented.
'I would set you this task: gather allies and go to the troll-camps south-east of Esteldin, beyond the trenches of Dol Dinen and slay as many as you can.'
Background
A great host of Orcs spilled through Ram Duath, driving the Men of the North Downs from their farms. Esteldin, home of the few remaining Dunedain of the North, was spared discovery. It is from there that the Rangers begin to plan their counter-offensive against the black tide of Angmar.
Objectives
Objective 1 Defeat trolls in Dol Dinen (0/16)
Trolls can be found beyond the trenches of Dol Dínen, south-east of Esteldín, under the cover of the smoke.
Hithlim told you of the night that the trolls pulled the great siege-engines of Angmar past his watch-post. Since then, they had been his greatest concern, and he has asked you to gather allies and slay as many as you can. Objective 2 Hithlim awaits your return at Esteldín.
You have defeated a large number of trolls. Now you should bring your report to Hithlin.
Tip: At 15.5S, 36.6 W there are two trolls grouped together. Once you fight to this area and kill them off, you can stand on the hill and kill them one at a time as they respawn. Good way for small groups to get the quest done without aggroing the elite orcs in the area as well.
Note: Also got Weakening the Tide as a follow-up, not sure if there is another quest that unlocks this, but did get Siegecraft as well.