Wildhammer Clan was an Alliancereputationfaction based in the Hinterlands. Even though quests and killing mobs would yield reputation, no rewards were available. They were the enemies of the Revantusk Trolls.
Patch 1.5.0(2005-06-07): The Wildhammer Clan in the Hinterlands is now a peaceful faction to the Alliance, meaning Alliance players cannot intentionally declare war on them.