The Silmarillion

But the Captain of Morgoth in the west had been commanded to draw out Fingon swiftly from his hills by whatever means he could. He marched on therefore until the front of his battle was drawn up before the stream of Sirion, from the walls of the fortress of Eithel Sirion to the inflowing of Rivil at the Fen of Serech; and the outposts of Fingon could see the eyes of their enemies. But there was no answer to his challenge, and the taunts of the Orcs faltered as they looked upon the silent walls and the hidden threat of the hills. Then the Captain of Morgoth sent out riders with tokens of parley, and they rode up before the outworks of the Barad Eithel. With them they brought Gelmir son of Guilin, that lord of Nargothrond whom they had captured in the Bragollach; and they had blinded him. Then the heralds of Angband showed him forth, crying: 'We have many more such at home, but you must make haste if you would find them; for we shall deal with them all when we return even so.' And they hewed off Gelmir's hands and feet, and his head last, within sight of the Elves, and left him.

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.

Then in the plain of Anfauglith, on the fourth day of the war, there began Nirnaeth Arnoediad, Unnumbered Tears, for no song or tale can contain all its grief. The host of Fingon retreated over the sands, and Haldir lord of the Haladin was slain in the rearguard; with him fell most of the Men of Brethil, and came never back to their woods. But on the fifth day as night fell, and they were still far from Ered Wethrin, the Orcs surrounded the host of Hithlum, and they fought until day, pressed ever closer. In the morning came hope, when the horns of Turgon were heard as he marched up with the main host of Gondolin; for they had been stationed southward guarding the Pass of Sirion, and Turgon restrained most of his people from the rash onslaught. Now he hastened to the aid of his brother; and the Gondolindrim were strong and clad in mail, and their ranks shone like a river of steel in the sun.

Now the phalanx of the guard of the King broke through the ranks of the Orcs, and Turgon hewed his way to the side of his brother; and it is told that the meeting of Turgon with Húrin, who stood beside Fingon, was glad in the midst of battle. Then hope was renewed in the hearts of the Elves; and in that very time, at the third hour of morning, the trumpets of Maedhros were heard at last coming up from the east, and the banners of the sons of Fëanor assailed the enemy in the rear. Some have said that even then the Eldar might have won the day, had all their hosts proved faithful; for the Orcs wavered, and their onslaught was stayed, and already some were turning to flight. But even as the vanguard of Maedhros came upon the Orcs, Morgoth loosed his last strength, and Angband was emptied. There came wolves, and wolfriders, and there came Balrogs, and dragons, and Glaurung father of dragons. The strength and terror of the Great Worm were now great indeed, and Elves and Men withered before him; and he came between the hosts of Maedhros and Fingon and swept them apart.