Great game and surprisingly overlooked. It's like Choplifter in looks and control but your objective is to soften the enemy for your team of tanks, vehicles, and soldiers to advance to the enemy base. It's kind of like tug-of-war with war machines. I paid $20 for it and would of gladly paid a little more. A quality title and fun game.
There's other vehicles too. The original game was called Super Army Wars on the GBA. There was a more recent games with the Glory Days name was a DSiware Tower Defense game.