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The Fall of Gondolin was the battle between the forces of Turgon and Melkor, after Maeglin betrayed the location of the Hidden Kingdom to the enemy.
In 551 FA, Turgon's nephew, Maeglin, divulged the secrets of Gondolin and its passes to Morgoth, who planned the assault for many years before finally unleashing his armies upon the unprepared Elves. Due to information passed by Maeglin, Morgoth's forces managed to surround the city without being detected, and it was besieged without any hope of victory or escape on the part of the Elves.
After the battle, most of the Gondolindrim (including Turgon and his captains) died, while some survived, such as Tuor, Idril, and their son Eärendil.