Anti-aircraft as its name, are extremely good at defending against air units. Due to its +8 Defence Bonus when in defence, it is a unit that must be used for defending. Its low Attack and Defence when not in a defensive stance makes it horrible for attacking. If air units happen to come acrosss Anti-Aircraft, engagement with it is a horrible option. It is rather advised that ground troops be used to take it out. Anti-Aircraft are rarely used though, due to the unwillingness of many players to use massed aircraft in World Maps.