Catapult

Siege unit that is used to destroy defencive structures, has 2% chance to make hole in the wall. If failed there is 1% chance to damage wall by one level. If there is no wall, castle is targeted. If that does not exist either, random building is targeted. Missed shots have 1% chance of damaging some other building. Note: do not use catapults if you want to conquer the city you are attacking, they can deal huge damage to all the buildings