Ghosts of Illidia
50 years ago, a large number of orcs were held prisoner after a war had broken out between the humans and the orcs. The humans saw profit in keeping the orcs as slaves and so brought them to the city of Weergrin. The orcs were forced to do heavy labor with minimum time to rest. They were kept in horrible conditions, chained, beaten, and raped.
Finally, 31 years later, an orc named Narg led the orcs in an uprising. The battle was brutal. The entire village was killed- every man, woman, and child. The orcs then continued south and unleashed their anger on the villages along the way. The death toll was high on both sides. Finally, Narg, satisfied that vengeance had been achieved, led the remaining orcs to the base of The Hidden Mountains where they created the town Gargenute. They have remained peaceful since then although they are very selective about who they let into the town.