§ Of the Ruin of Beleriand and the Fall of Fingolfin The Silmarillion

Then Húrin answered him: The King's grace is great indeed; but if our word is not enough, then we will swear oaths to you.' And the brothers swore never to reveal the counsels of Turgon, and to keep secret an that they had seen in his realm. Then they took their leave, and the eagles coming bore them away by night, and set them down in Dor-lómin before the dawn. Their kinsfolk rejoiced to see them, for messengers from Brethil had reported that they were lost; but they would not declare even to their father where they had been, save that they were rescued in the wilderness by the eagles that brought them home. But Galdor said: Did you then dwell a year in the wild? Or did the eagles house you in their eyries? But you found food and fine raiment, and return as young princes, not as waifs of the wood.' And Húrin answered: 'Be content that we have returned; for only under an oath of silence was this permitted.' Then Galdor questioned them no more, but he and many others guessed at the truth; and in time the strange fortune of Húrin and Huor reached the ears of the servants of Morgoth.