there are several such a tank games out there, but usually with a 3rd person view (I tried only one what is frequently played by the son of my brother, where you fight in teams, and you can select new armours, weapons, or features resulting in new abilities like higher speed, as your points are increasing). I only know one futuristic battle ship game, but an ancient Greek-Persian or Roman-Carthaginian would be cool (the latter would have more development possibilities).