At this time Hurin and Huor, the sons of Galdor of Dor-lomin, were dwelling with the Haladin, for they were akin. In the days before the Dagor Bragollach those two houses of the Edam were joined at a great feast, when Galdor and Gloredhel the children of Hador Goldenhead were wedded to Hareth and Haldir the children of Halmir lord of the Haladin. Thus it was that the sons of Galdor were fostered in Brethil by Haldir their uncle, according to the custom of Men in that time; and they went both to that battle with the Orcs, even Huor, for he would not be restrained, though he was but thirteen years old. But being with a company that was cut off from the rest they were pursued to the Ford of Brithiach, and there they would have been taken or slain but for the power of Ulmo, that was still strong in Sirion. A mist arose from the river and hid them from their enemies, and they escaped over the Brithiach into Dimbar, and wandered among the hills beneath the sheer walls of the Crissaegrim, until they were bewildered in the deceits of that land and knew not the way to go on or to return. There Thorondor espied them, and he sent two of his eagles to their aid; and the eagles bore them up and brought them beyond the Encircling Mountains to the secret vale of Tumladen and the hidden city of Gondolin, which no Man yet had seen.”

"But Thorondor took his way far above the earth, seeking the high roads of heaven, where the sun daylong shines unveiled and the moon walks amid the cloudless stars. Thus they passed swiftly over Dor-nu-Fauglith, and over Taur-nu-Fuin, and came above the hidden valley of Tumladen. No cloud nor mist lay there, and looking down Luthien saw far below, as a white light starting from a green jewel, the radiance of Gondolin the fair where Turgon dwelt."

Then they were led up the mighty ravine of Orfalch Echor, barred by seven gates, and brought before Ecthelion of the Fountain, the warden of the great gate at the end of the climbing road; and there Tuor cast aside his cloak, and from the arms that he bore from Vinyamar it was seen that he was in truth one sent by Ulmo. Then Tuor looked down upon the fair vale of Tumladen, set as a green jewel amid the encircling hills; and he saw far off upon the rocky height of Amon Gwareth Gondolin the great, city of seven names, whose fame and glory is mightiest in song of all dwellings of the Elves in the Hither Lands.”

-The Silmarillion

Paintings by Alan Lee and Ted Nasmith