There he [Tuor] became weary from the stanging heat and was beaten down by a great demon, even Gothmog lord of the Balrogs, son of Melko. But lo! Ecthelion, whose face was of the pallor grey steeland whose shield-arm hung limp at his side, strode above him as he fell; and that Gnome drave at the demon, yet did not give him his death, getting rather a wound to his sword-arm that his weapon left his grasp. Then leapt Ecthelion, lord of the Fountain, fairest of the Noldoli, full at Gothmog even as he raised his whip, and his helmet that had a spike upon it he drave into that evil breast, and he twined his legs about his foeman’s thighs; and the Balrog yelled and fell forward; but those two dropped into the basin of the king’s fountain which was very deep. There found that creature his bane; and Ecthelion sank steel-laden into the depths, and so perished the lord of the Fountain after fiery battle in cool waters.
"The Fall of Gondolin" - The Book of Lost Tales (part. 2) - HoME - J.R.R. Tolkien