Orcs: First Age (p2)

After their crushing defeat in the Dagor Aglareb and in a minor raid on Hithlum, the Orcs nevertheless regained their numbers. In the Dagor Bragollach and Nirnaeth Arnoediad, they and their master won crushing victories against the free peoples. However, they were nearly destroyed in the War of Wrath, and those that survived fled eastwards into the Mountains of Angmar and the Grey Mountains.