§ Of Beren and Lúthien The Silmarillion

Beren stood beside Thingol, and suddenly they were aware that Huan had left their side. Then a great baying awoke in the thicket; for Huan becoming impatient and desiring to look upon this wolf had gone in alone to dislodge him. But Carcharoth avoided him, and bursting form the thorns leaped suddenly upon Thingol. Swiftly Beren strode before him with a spear, but Carcharoth swept it aside and felled him, biting at his breast. In that moment Huan leaped from the thicket upon the back of the Wolf, and they fell together fighting bitterly; and no battle of wolf and hound has been like to it, for in the baying of Huan was heard the voice of the horns of Oromë and the wrath of the Valar, but in the howls of Carcharoth was the hate of Morgoth and malice crueller than teeth of steel; and the rocks were rent by their clamour and fell from on high and choked the falls of Esgalduin. There they fought to the death; but Thingol gave no heed, for he knelt by Beren, seeing that he was sorely hurt.