§ Of the Voyage of Eärendil and the War of Wrath The Silmarillion

For the sons of Fëanor that yet lived came down suddenly upon the exiles of Gondolin and the remnant of Doriath, and destroyed them. In that battle some of their people stood aside, and some few rebelled and were slain upon the other part aiding Elwing against their own lords (for such was the sorrow and confusion in the hearts of the Eldar in those days); but Maedhros and Maglor won the day, though they alone remained thereafter of the sons of Fëanor, for both Amrod and Amras were slain. Too late the ships of Círdan and Gil-galad the High King came hasting to the aid of the Elves of Sirion; and Elwing was gone, and her sons. Then such few of that people as did not perish in the assault joined themselves to Gil-galad, and went with him to Balar; and they told that Elros and Elrond were taken captive, but Elwing with the Silmaril upon her breast had cast herself into the sea.