Umuzmatin

Umuzmatin was a sizable dwarven kingdom in Vastemar, which had played a major role in guarding the Ulthark Marches for long centuries. It was often described by humans as a "dwarven empire," due it's political structure of multiple semi-autonomous regions ruled by client-kings swearing allegiance to a high king or over-king, but the dwarves did not regard it as such. Umuzmatin was finally overrun and destroyed by Gol Garga's horde during the recently concluded Orcish Wars. 
Of all the dwarven realms in Vastemar, the largest proportion of Umuzmatin's populace escaped with their lives; a great many of the kingdom's non-combatants had been sent for refuge in Kuzul-Kadrin, XXXXX, XXXXXX and other dwarven lands prior to the collapse of the kingdom's defenses. A large part of Umuzmatin's army also managed to escape the kingdom's destruction, withdrawing to the northeast and joining with other human and dwarf forces coming from beyond Vastemar's borders to confront the horde. A sizable contingent of Umuzmatinu troops were present in the allied army at the decisive Battle of Crow's Gorge.
Like Thuldaran and Thubala, and the human kingdoms of Vastemar, the lands that once made up Umuzmatin are now divided among various orcish warlords.