Fall of Gondolin
The city of Gondolin, long hidden from the eyes of Morgoth, fell to treachery by the bitter Elf Maeglin. Belryg, Orcs, wolves and dragons surrounded the city and began a siege. Ecthelion and the Balrog Gothmog killed each other, Glorfindel and another Balrog similarly killed each other, and High King Turgon died in his tower. The traitor Maeglin also fell from the walls of the city to his death below.