Scourge Invasion (Orgrimmar)

Part of the Scourge Invasion was fought in Orgrimmar, this battle is also called The Winds of War and Echoes of Doom.

The battle
Garrosh Hellscream, who was clearly displeased with warchief Thrall's lack of immediate action against the humans and the Scourge, challenged the latter to a duel (though Thrall had to force Garrosh by "insulting" his father).

When the two were duelling, the Scourge attacked the city forcing the two orc leaders to stop their duel and take up arms against the undead fiends. Backed by many adventurers, grunts, Orgrimmar Marksmen, and Lady Sylvanas Windrunner's skeletons the Horde defended it's capital, fighting tooth and nail. Despite the handicap of having no air forces, the Marksmen (despite many of their number being eaten by the Frost Wyrms) and the local adventurers who just returned from Outland, were able to take them down while the ground forces fought the Abominations and Death Knights.

A moment later the Herald called back his forces, taunting the Horde to Northrend. After mopping up the few Scourge left, the warchief was forced to form and send the Horde Expedition towards Northrend, thus properly beginning the war against the Lich King.

Video
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Comic version of the battle
Although the same event, the comic and the game show some differences:
 * 1) Rehgar Earthfury helped defend the city in the comic, but in game could not be found.
 * 2) In game, Varok Saurfang aided the Horde in the defense of the capital while in the comic he was not present, but later Thrall ordered him to prepare for battle, meaning that he was in the battle but was not shown.
 * 3) The death knights did not appear in game.
 * 4) Garrosh had the upper hand when battling Thrall in game, this is not the case in the comic.