Third War

The Third War (also known as the Third Great War, the Chaos War, and the Reign of Chaos) was a massive conflict between the mortal races of Azeroth and the demons of the Burning Legion which took place on the Eastern Kingdoms, Northrend and Kalimdor. The Third War began in earnest when the Capital City of the human kingdom of Lordaeron fell to the Scourge army led by the death knight Arthas Menethil, and ended with the defeat of the demon commander Archimonde on Mount Hyjal. It was the second invasion of the Burning Legion. During the war, the ancient night elves were reintroduced to the world.