Question aboiut "The Northern Front" quest in Tarlang's Crown

Hi,

I was wondering what prerequisite quests must be done to be given the quest "The Northern Front" in Tarlang's Crown. It looks like it is given by Harnion just below the south barricade but I have not seen the quest yet. I have been sent to Gondren and did the first of his quests. I have also talked with Melril but she has no quests for me yet. Thanks!