Dol Guldur (End of the Third Age)

The powerfull fortress of Dol Guldur was apparently abandoned after the Necromancer's defeat. But secretly, a band of Gundabad and Moria Orcs were dispatched by Sauron to inhabit the fortress and began the forging and breeding of new orcs. The infamous Mordú, who had recently joined Sauron also travelled to Dol Guldur, Mordú's influence in the bandits and corrupt Men that lived near to Dol-Guldur was big. Easily, Mordú recruited many Evil Men and started lessons of sorcery to some of the most clever corrupt men.

More Orcs from Gundabad and Moria arrived, the orc chieftain Klarbug was one of the first Guldur Masters and he founded the kitchens of Dol Guldur and the slavery of Elves and men in the pits of Dol-Guldur. Dol Guldur pitmasters began recruiting Trolls and breeding Guldur-Trolls. In that time, Mirkwood was so quiet that even Legolas son of Thranduil did not noted the productions in Dol Guldur.

In T.A 2996, the Ringwraith Khamûl travelled to Dol Guldur while Mordú was summoned by Sauron to Mordor to work in some letters and books that Sauron was requiring. With Khamûl arrival, fell-beasts soon began inhabit the Hill of Sorcery.

In the War of the Ring, Dol Guldur's forces proved to be strong and powerfull while the productions of Dol Guldur (Kitchens, forges etc) were way bigger and powerfull. Dol Guldur attacked Thranduil's fortress two times and attacked elven outposts and camps many times. It also attacked Lorien 3 times. But the Guldur Orcs were defeated in this battles. After Sauron's death, all the nazgul were killed too. So Khamûl could not led the Guldur forces again. Without an powerfull leader, the Guldur Orcs, Men and Trolls were easily defeated in smaller attacks on Mirkwood. Galadriel, Celeborn and Thranduil decided that Dol Guldur should be destroyed. 1 Day after the decision, an army of elves attacked Dol Guldur, Ents arrived and crushed the Guldur-Trolls. In the end, Galadriel used all her power in the fortress and only large amounts of stone and many ruined forges, watchtowers were still in the Volcano.

However, in the Fourth Age, Celeborn and the remaining elves leaved Middle Earth and sailed to Aman. Many orcs and trolls that survived the War of the Ring began inhabit the dark forests of Lorien and Mirkwood, using Dol Guldur as they capital.