Sabotage is a fixed shooter video game for the Apple II written by Mark Allen and published by On-Line Systems in 1981.
The turret can swivel to cover a large area of the screen, but cannot move from its base.
Helicopters fly across the screen at varying heights, progressively lower over time, dropping paratroopers.
Firing a shell costs the player one point, so if one is playing for score, there is an incentive to conserve ammo.
If four land on a side, they are able to build a human pyramid and climb up to the turret and blow it up once the sky is clear.