The Witherbark trolls were once allies to the Horde, but they betrayed Thrall... and that must be punished!$B$BHere, take my pike and go to the Hinterlands, far to the north.  You will find it northeast of Tarren Mill, a village held by our allies, the Forsaken.$B$BWhen you enter the Hinterlands, hunt Witherbark trolls.  Gather their skulls and drive my pike into the ground at one of their smaller villages, Hiri'watha or Zun'watha.$B$BShow them their vile actions are of consequence!