Dom Pedro II
Modder For Life
A catapult tries to bombard an enemy 1 tile away, it has a 50% accuracy rate, so 1 in 2 times the catapult will miss and thus end up doing no damage to the unit.
Did I explain it better?
This way, bombardment / archer barrage isn't no penalty/all reward, because if the unit fails (misses) then it loses a movement point/wastes a turn.
Well, I think what might be even better is to have variable damage ranging from nothing (a miss) to some max amount of damage (a direct hit). An artillery unit could gain XP from each direct hit it scores.