first one is the very first mob you'll come across. A little before the first intersection.
2nd one, take the first left branch as poted below. Follow it straight up north till it turns west and you have a choice to go North or South. Go left (south) and follow the left hillside a ways into the mob camp that is there. I was invis but got agro from the Borer which I didn't even see and pulled him with no adds back to our group waiting close by.
Run back to the first intersection (mobs have probably repopped so be wary) and go straight east which would be the first right coming from the zone-line
Follow this eastern trail and you'll come acroess the 3rd mob on your way to the bridge. No surprises, you'll see him.
For the last mob to finish this part of the warrior epic continue north along the eastern trail and take the last path to left. You'll see the mob before he agro's, unless perhaps you're short, it's pretty hilly around there.