Fall of Tol Sirion

Tol Sirion was an island that was held by Orodreth against the dark forces of Angband. After the Battle of Sudden Flame, and the slaying of Fingolfin, Morgoth sent Sauron to attack Tol Sirion. Sauron managed to defeat the armies and drove Orodreth away. Tol Sirion would become Tol-in-Gaurhoth, and it is here Sauron would dwell and direct his malevolent armies.