Total Annihilation (abbr. TA) is a critically-acclaimed real-time strategy game created by Cavedog Entertainment and released on September 30, 1997 by GT Interactive for Microsoft Windows and Mac OS. It was the first RTS game to feature 3D units and terrain. Two expansion packs were released, The Core Contingency on April 30, 1998 and Battle Tactics on June 30, 1998. [source:wikipedia]