When will a player choose to use his artillery to defend against air units?
In a SBR for sure, but not always in a land based combat! So under what circumstances will one direct the artillery on air units? To answer that question one need to take a closer look at the odds!
Artillery directed against air
Cost damage to attacker: 1/6 * 10 IPCs (15 IPCs if a bomber) = 1.67 IPCs (2.5 IPCs if a bomber)
Cost reduction to defender (opening fire): 1/6(chance) * 3/6 (fightrer) *3 IPCs (infantry casualty) = 0.25 IPCs
Total benefit: >2 IPCs *
*In fact the possibilty of targeting air units is also an advantage that will ad up for each cycle of combat after the first one, since one would never pick an expensive air unit as a casualty as long as there are cheaper units to pick. On the other hand an artillery directed against air units may not be destroyed in order to satisfy a loss and are considered to be captured if the attacking player should conquer the territory.
Artillery directed against land
Cost damage to attacker: 2/6 * 3 IPCs (Infantry casualty) = 1 IPC
Cost damage to attacker (air supremacy): 3/6 * 3 IPCs (Infantry casualty) = 1.5 IPCs
Bottom line
One will direct the artillery against air:
–As long as one think the combat will not last for more than 2 cycles*.
–And if one think he will win the combat so these artillery don’t fall into enemy hands.
*If one can get air supremacy that will affect any other defending artillery directed against land. In that case one would always direct some artillery against air.