After the catastrophe of the Fifth Battle, the Nírnaeth Arnoediad, the boy Túrin is sent to Doriath for protection from Morgoth's special enmity for the House of Húrin. Beleg becomes the mentor, steadfast friend and brother-in-arms of Túrin Turambar. The two fight together in defending the north marches of Doriath from the Orcs of Morgoth. When Túrin is accused of murder, Beleg searches out and produces at the last moment a witness who can testify to extenuating circumstances. When Túrin pridefully leaves Doriath after the affair, Beleg receives permission from Thingol to follow him into exile and is granted the sword Anglachel to help in this endeavour. Beleg long seeks Túrin. At Amon Rûdh he is captured and tortured by Túrin's men, until Túrin returns and releases him. Although Beleg beseeches Túrin to return to Doriath, where he has been pardoned and would be welcomed, Túrin still pridefully refuses and Beleg loyally chooses to stay with Túrin. Together, with Túrin wearing the Dragon-helm of Dor-lómin, they lead a band of men against the invaders of Morgoth. The land where the "Two Captains" dwell becomes known as the Land of Helm and Bow, but the small realm was destroyed two years later.
When Túrin is captured by Morgoth in a treacherous ambush, Beleg is grievously wounded. Yet with the strength of a great Elven warrior and his extraordinary healing skills, he recovers swiftly and tracks the Orcs. In the deadly land of Taur-nu-Fuin Beleg meets the elf Gwindor, recently escaped from Morgoth's thraldom, and together they rescue Túrin, with Beleg performing an heroic feat ofbowmanship, slaying numerous wolf sentinels in the dark. After they carry Túrin from the Orc-camp, while removing Túrin's bonds, Beleg accidentally cut Túrin with his sword. Túrin awakes and does not recognize Beleg in the darkness, mistaking the shape over him with a blade as an Orc. In a sudden rage of self-defence, he wrests the sword from Beleg and kills him. When he recognizes the truth of his friend's loyalty and bravery and his own fatal mistake, Túrin is so overcome with grief that he walks in a daze for weeks, being led out of danger by Gwindor. After returning to himself, Túrin takes Beleg's sword Anglachel, renaming it Gurthang ("Iron of Death"), and wields it in further battles against Morgoth's forces for the rest of his life. Years later, Túrin himself dies upon the sword Gurthang when his tragic life becomes too hard to bear, and the sword is thus avenged for the death of Beleg.
"Now the streets of Gondolin were paved with stone and wide, kerbed with marble, and fair houses and courts amid gardens of bright flowers were set about the ways, and many towers of great slenderness and beauty builded of white marble and carved most marvelously rose to the heaven. Squares there were lit with fountains and the home of birds that sang amid the branches of their aged trees, but of all these the greatest was that place where stood the King's palace, and the tower thereof was the loftiest in the city, and the fountains that played before the doors shot twenty fathoms and seven in the air and fell in a singing rain of crystal; therein did the sun glitter splendidly by day, and the moon most magically shimmered by night. The birds that dwelt there were of the whiteness of snow and their voices sweeter than a lullaby of music.
the Vala Ulmo, the Lord of Waters, revealed the location of the Vale of Tumladen to the Noldorin Lord Turgon in a dream around the year FA 50. Under this divine guidance, Turgon travelled from his kingdom in Nevrast and found the vale in FA 53. Within the Echoriath just west of Dorthonion and east of the River Sirion, lay a round level plain with sheer walls on all sides and a ravine and tunnel leading out to the southwest known as the Hidden Way. In the middle of the vale there was a steep hill which was calledAmon Gwareth. There Turgon decided to found a great city that would be protected by the mountains and hidden from the Dark Lord Morgoth.
For nearly seventy-five years, Turgon and his people built Gondolin in secret. After it was completed in FA 116, he took with him to dwell in the hidden city his entire people in Nevrast — almost a third of the Ñoldor — as well as nearly three quarters of the northern Sindar. The city stood for nearly 400 years until it was betrayed to Morgoth by Maeglin, Turgon's nephew, and sacked by the army of Morgoth the Dark Lord.