Expose who betrayed the ogres 0/1 (Blightfire Moors)
Upstairs is Klugg, Hail him and go through the text, he will attack
Outside the tower are the Patrol Leaders, Hail Klugg and go through the text, he will attack
It's easy to mistakenly think you need to go inside the tower to find Klugg, when he is outside, going inside you'd have to clear invaders, which won't count toward the number that you need.