After the army of Nargothrond went out to meet Morgoth's army led by Glaurung on the field of Tumhalad, some miles north of the citadel. They were defeated and routed, and those Elves left in the city awaiting their return, instead found the Dragon and his Orcs crossing their bridge and entering the citadel meeting little to no resistance. These people, including Orodreth's daughter Finduilas, were killed or captured and sold into slavery by the Orcs and driven northward to Angband.
Coming late to the sack were Túrin and some few other survivors of the Battle of Tumhalad. At the sight of the Dragon, Túrin's companions who accompanied him fled, but Túrin himself stayed and came face-to-face with dragon and was prepared to fight him, but was placed under Glaurung's dragon-spell, and forced to watch as the captives were driven away. Then Glaurung released Túrin, from his spell talking to him of his family still in Dor-lómin making him forget about rescuing Finduilas. Knowing the evil that this would cause to Túrin, Glaurung settled down to enjoy his treasure horde in the newly-sacked domain where he would remain for nearly five years.
- The Silmarillion: Quenta Silmarillion, "Of Túrin Turambar"
- The Children of Húrin: The Fall of Nargothrond
- The Complete Guide to Middle-earth
- The Atlas of Middle-earth pgs. 26-7