The Silmarillon

But in the morning when the storm was passed, Tuor came upon an Elf standing beside the walls of Vinyamar; and he was Voronwe, son of Aranwe, of Gondolin, who sailed in the last ship that Turgon sent into the West. But when that ship returning at last out of the deep ocean foundered in the great storm within sight of the coasts of Middle-earth, Ulmo took him up, alone of all its mariners, and cast him onto the land near Vinyamar; and learning of the command laid upon Tuor by the Lord of Waters Voronwe was filled with wonder, and did not refuse him his guidance to the hidden door of Gondolin. Therefore they set out together from that place, and as the Fell Winter of that year came down upon them out of the north they went warily eastward under the eaves of the Mountains of Shadow/ At length they came in their journeying to the Pools of Ivrin, and looked with grief on the defilement wrought there by the passage of Glaurung the Dragon; but even as they gazed upon it they saw one going northward in haste, and he was a tall Man, clad in black, and bearing a black sword. But they knew not who he was, nor anything of what had befallen in the south; and he passed them by, and they said no word.

And at the last by the power that Ulmo set upon them they came to the hidden door of Gondolin, and passing down the tunnel they reached the inner gate, and were taken by the guard as prisoners. 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.

At the bidding of Ecthelion trumpets were blown on the towers of the great gate, and they echoed in the hills; and far off but clear there came a sound of answering trumpets blown upon the white walls of the city, flushed with the rose of dawn upon the plain.

Thus it was that the son of Huor rode across Tumladen, and came to the gate of Gondolin; and passing up the wide stairways of the city he was brought at last to the Tower of the King, and looked upon the images of the Trees of Valinor. Then Tuor stood before Turgon son of Fingolfin, High King of the Noldor, and upon the King's right hand there stood Maeglin his sister-son, but upon his left hand sat Idril Celebrindal his daughter; and all that heard the voice of Tuor marvelled, doubting that this were in truth a Man of mortal race, for his words were the words of the Lord of Waters that came to him in that hour. And he gave warning to Turgon that the Curse of Mandos now hastened to its fulfilment, when all the works of the Noldor should perish; and he bade him depart, and abandon the fair and mighty city that he had built, and go down Sirion to the sea.