Space Canyon - Atari - Shooter, Sci-Fi

Your Tactical Advanced Weapons Tank (TAWT) is out on a routine patrol through Sighah Canyon when it is suddenly ambushed by the Polydites, a hostile warring faction. Both ends of the canyon have enemy tanks closing in and enemy ships are attacking from above. High Command, hearing of the situation, has written you off as another casualty. You have no choice but to fight. You know your strengths and with a little luck you feel you might prevail.