Lost Mine of Phandelver
Sildar believes that Klarg sent the map and the dwarf to the chief of the Cragmaws at a place called Cragmaw Castle.
On Uktar 20, 1491, the Seekers found Cragmaw Castle after being given directions by Reidoth the druid. The Seekers fought through the Cragmaw goblins and hobgoblins, eventually slaying the bugbear who served as the Cragmaw Chieftain, his wolf, and doppleganger. They were able to rescue Gundren Rockseeker, as well as help cleanse the defiled shrine.
It has been suggested to Sildar that The Lord's Alliance make an attempt to reclaim Cragmaw Castle.