Silmarillion Chapter 3: Of the Coming of the Elves and the Captivity of Melkor

"But at the last the gates of Utumno were broken and the halls unroofed,  and Melkor took refuge in the uttermost pit. Then Tulkas stood forth as  champion of the Valar and wrestled with him, and cast him upon his  face; and he was bound with the chain Angainor that Aulë had wrought,  and led captive; and the world had peace for a long age"