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The Siege of the Black Temple was the final confrontation between Magtheridon's demonic legions and Illidan's followers for control of Outland.
Prelude
After successfully closing Magtheridon's Shadow Portals and thereby cutting off the mighty Pit Lord's supply of reinforcements, Illidan, Prince Kael'thas and Lady Vashj marched upon the Black Temple. Magtheridon was outraged by this development, but typically for his arrogant kind he was not unduly worried- his citadel was extremely well protected by war machines and armies of Fel Orcs and Demons, led by the powerful Mistress of Torment and Master of Pain. As the Illidari made their approach he swore to crush the Demon Hunter and his retainers.
The Battle
Illidan split his forces, joining Prince Kael on a frontal assault of the Temple whilst Vashj and her Naga insinuated themselves into the vast citadel's sewer and aqueduct system. Kael and Illidan immediately ran into problems in the form of Magtheridon's infernal war machines, which slaughtered many blood elves as they assaulted the Temple gates. Fortunately, Akama and his Draenei arrived, pledging their services to Illidan. They were able to infiltrate the Temple and destroy the network crystals which powered the war machines, allowing Kael and Illidan's forces to overrun the gates. They claimed an armoury containing several Fel Orc Demolishers, which they used to blast apart the Fel Orc encampments. Using the shadowy might of the Draenei again and again to sabotage Magtheridon's war machines, Illidan and Kael swept aside the Fel Orcs and Demons to battle and then kill the Master of Pain.
Meanwhile, Vashj and her small group of Naga routed several flotillas sent to engage them and destroyed two subterranean bases, the Fel Orcs proving no match for the awesome might of Vashj's Royal Guard. With her remaining troops Vashj then fought the Mistress of Torment and her retinue, the Sea Witch eventually overcoming the vicious Succubus.
With both of his lieutenants dead, the door to Magtheridon's chambers opened. Illidan, Kael, Akama and Vashj joined forces along with several captive Fel Orcs and Demons and assaulted the Pit Lord directly. After a terrible battle which killed many of the Illidari, Magtheridon was finally defeated.
Aftermath
Illidan claimed himself Ruler of Outland, and the remaining Fel Orcs and Demons surrendered. However, the Demon Hunter's triumph was short-lived; barely an hour after the battle, the skies above the Black Temple clouded and the spectral form of Kil'jaeden appeared, demanding Illidan complete his task of destroying the Lich King. Cowed, Illidan once again gathered the Blood Elves and the Naga to him and marched upon Northrend.
As with Maiev, Magtheridon was originally thought dead, but instead Illidan held him captive underneath the Temple, using his blood to create more fel orcs.