War against the Lich King

The War against the Lich King was the series of conflicts that followed Arthas Menethil's attacks on Stormwind City and Orgrimmar soon after King Varian Wrynn returned to the throne of Stormwind. The war was fought primarily in Northrend - involving the Grand Alliance, New Horde, Undead Scourge, Kirin Tor, Red Dragonflight and Blue Dragonflight.