§ Akallabêth The Silmarillion

Nonetheless for long it seemed to the Númenóreans that they prospered, and if they were not increased in happiness, yet they grew more strong, and their rich men ever richer. For with the aid and counsel of Sauron they multiplied then: possessions, and they devised engines, and they built ever greater ships. And they sailed now with power and armoury to Middle-earth, and they came no longer as bringers of gifts, nor even as rulers, but as fierce men of war. And they hunted the men of Middle-earth and took their goods and enslaved them, and many they slew cruelly upon their altars. For they built in their fortresses temples and great tombs in those days; and men feared them, and the memory of the kindly kings of the ancient days faded from the world and was darkened by many a tale of dread.