Speak with Lachlan MacGraff at Kirthaven in Twilight Highlands.
After the licking we just gave 'em, the Dragonmaw assaults on Thundermar ought to stop. Maybe the Wildhammer do have a place in your Alliance - we Thundermars certainly owe you a debt.
Up in Kirthaven, our Grand Shaman Lachlan MacGraff has been trying to arrange a summit between the surviving Wildhammer family leaders. It's a tall order to get us all to work together, but I'm at least willing to give it a go.
Fly up to Kirthaven in the North and talk to Lachlan MacGraff. I'll meet you there!