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In chess, an opponent’s piece can be attacked if it occupies a space that the attacker can move one of its pieces to using the proscribed move for the attacking piece.

In ground combat, a system must first acquire an opponent’s system before attacking. Unlike chess, where all pieces are seen by both sides and all possible attacks can be easily identified, combat systems have to find an enemy entity before attacking. Once that entity is acquired, it can then be attacked. The acquisition process can be from the attacking system, from a third party, or from a combination of systems on the battlefield. A tank or an infantryman typically acquires its own targets to attack, where indirect fire assets such as attack aircraft, mortars, and artillery usually attack targets that have been identified by another entity on the battlefield. Once it is decided, a system will engage a target, there may be different attack mechanisms that can be employed and must be specified. Systems often have more than one weapon. A tank has a main gun and a coaxial machine gun. An infantry fighting vehicle has a 25‐mm chain gun and an anti‐tank missile. An infantryman has a rifle, grenades, and a bayonet. A tank’s main gun has different types of main gun ammunition for different purposes.