§ Of the Fifth Battle: Nirnaeth Arnoediad The Silmarillion

By ill chance, at that place in the outworks stood Gwindor of Nargothrond, the brother of Gelmir. Now his wrath was kindled to madness, and he leapt forth on horseback, and many riders with him; and they pursued the heralds and slew them, and drove on deep into the main host. And seeing this all the host of the Noldor was set on fire, and Fingon put on his white helm and sounded his trumpets, and all the host of Hithlum leapt forth from the hills in sudden onslaught. The light of the drawing of the swords of the Noldor was like a fire in a field of reeds; and so fell and swift was their onset that almost the designs of Morgoth went astray. Before the army that he sent westward could be strengthened it was swept away, and the banners of Fingon passed over Anfauglith and were raised before the walls of Angband. Ever in the forefront of that battle went Gwindor and the Elves of Nargothrond, and even now they could not be restrained; and they burst through the Gate and slew the guards upon the very stairs of Angband, and Morgoth trembled upon his deep throne, hearing them beat upon his doors. But they were trapped there, and all were slain save Gwindor only, whom they took alive; for Fingon could not come to their aid. By many secret doors in Thangorodrim Morgoth had let issue forth his main host that he held in waiting, and Fingon was beaten back with great loss from the walls.