Combat Two is a game that was developed for the Atari 2600 but was never released. It is a sequel to Combat. It does appear as one of the selectable games on the Atari Flashback 2 system.
It is similar to the Tanks game in Combat with some noticeable differences:
Environments were an arena with a river in the middle with two bridges, forests that the tanks can use for cover, and brick walls that could be shot through or used for cover. The tanks themselves moved by themselves with the player turning the tank and controlling the speed. This game had three lives that could be used — three hits and the player loses a life — while the original allowed you to get as many shots in until the time ran out. The graphics overall were improved over the original.