Kill Kurtok the Slayer.
The rampaging orc horde is lead by a savage beast known as Kurtok the Slayer! Kurtok is responsible for the recent invasion and must be killed if we are to have peace in the valley.
Venture back east, across the river and through the vineyard, and look for the passage leading into the mountains. Kurtok will be there, preparing for another assault. Kill him and return to me.
With Kurtok slain we are safe once again from the orcish hordes. I will send peasants to the pass in an attempt to seal the passage so that no more orcs may come through into our territory.
You have the thanks of Stormwind and of the Alliance, hero!