§ Of the Coming of the Elves and the Captivity of Melkor The Silmarillion

It is told that when the hosts of the Eldalië departed from Cuiviénen Oromë rode at their head upon Nahar, his white horse shod with gold; and passing northward about the Sea of Helcar they turned towards the west. Before them great clouds hung still black in the North above the ruins of war, and the stars in that region were hidden. Then not a few grew afraid and repented, and turned back, and are forgotten.