§ Of the Fifth Battle: Nirnaeth Arnoediad The Silmarillion

The realm of Fingon was no more; and the sons of Fëanor wandered as leaves before the wind. Their arms were scattered, and their league broken; and they took to a wild and woodland life beneath the feet of Ered Lindon, mingling with the Green-elves of Ossiriand, bereft of their power and glory of old. In Brethil some few of the Haladin yet dwelt in the protection of their woods, and Handir son of Haldir was their lord; but to Hithlum came back never one of Fingon's host, nor any of the Men of Hador's house, nor any tidings of the battle and the fate of their lords. But Morgoth sent thither the Easterlings that had served him, denying them the rich lands of Beleriand which they coveted; and he shut them in Hithlum and forbade them to leave it. Such was the reward he gave them for their treachery to Maedhros: to plunder and harass the old and the women and the children of Hador's people. The remnant of the Eldar of Hithlum were taken to the mines of the north and laboured there as thralls, save some that eluded him and escaped into the wilds and the mountains.'