He arrived over the western walls of Gondolin, carrying Balrogs upon his back. During the ensuing chaos, Ecthelion and Tuor were confronted by the Urulóki and it almost trampled on them. Tuor then hewed the foot of the beast. The fire-drake was said to have sprouted flames and screamed, and he lashed his tail and killed many Orcs and Gondothlim in his agony. Thus, Tuor and Ecthelion were able to escape the beast. It is possible that this dragon is the grandfather of the mighty Smaug.