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The sequel to the 1997 Cavedog real-time strategy hit, Total Annihilation: Kingdoms changes the locale and the backdrop -- instead of mechanized mayhem, it's wizards and swordsmen. There was also an expansion entitled Total Annihilation: Kingdoms - Iron Plague.
Originally released in 1997, Cavedog's original Total Annihilation broke new ground in RTS gaming. An expansion pack was released entitled The Core Contingency.