Atari 800 Game: Outlaw/Howitzer (1979 Atari)
A collection of 2 mini-games:
Howitzer: Each player controls a tank on either side of a river. The tank can move in all directions, and the player can control the angle of their turret to fire towards the enemy. A point is scored by destroying an enemy tank..
Outlaw: Two gunfighters shoot at each other across a field of cacti. The outlaw can move in all directions, and can fire straight or on an angle. Cacti deflect bullets. A point is scored by hitting the enemy.