§ Akallabêth The Silmarillion

In the Great Battle when at last Morgoth was overthrown and Thangorodrim was broken, the Edain alone of the kindreds of Men fought for the Valar, whereas many others fought for Morgoth. And after the victory of the Lords of the West those of the evil Men who were not destroyed fled back into the east, where many of their race were still wandering in the unharvested lands, wild and lawless, refusing alike the summons of the Valar and of Morgoth. And the evil Men came among them, and cast over them a shadow of fear, and they took them for kings. Then the Valar forsook for a time the Men of Middle-earth who had refused their summons and had taken the friends of Morgoth to be their masters; and Men dwelt in darkness and were troubled by many evil things that Morgoth had devised in the days of his dominion: demons, and dragons, and misshapen beasts, and the unclean Orcs that are mockeries of the Children of Ilúvatar. And the lot of Men was unhappy.