Cuentos inconclusos de Númenor y la Tierra Media
For another 500 years, Moria was left to the Balrog; though according to "Unfinished Tales", Orcs crept in soon after the Dwarves were driven out, leading to Nimrodel's flight. Sauron began to put his plans for war into effect, and he sent Orcs and Trolls to the Misty Mountains to bar the passes.