§ Of the Fifth Battle: Nirnaeth Arnoediad The Silmarillion

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.