War of Wrath
In "The Silmarillion", the forested highlands of Dorthonion in the north of Beleriand (in the northwest of Middle-earth) eventually fell under Morgoth's control and was subjugated by creatures of Sauron, then Lord of Werewolves. Accordingly, the forest was renamed "Taur-nu-Fuin" in Sindarin, "Forest of Darkness", or "Forest of Nightshade"; Tolkien chose to use the English form "Mirkwood". Beren becomes the sole survivor of the men who once lived there as subjects of the Noldor King Finrod of Nargothrond. Beren ultimately escapes the terrible forest that even the Orcs fear to spend time in. Beleg pursues the captors of Túrin through this forest in the several accounts of Túrin's tale. Along with the rest of Beleriand, this forest was lost in the cataclysm of the War of Wrath at the end of the First Age.