A fighter pulls down the top bale, making it 2 bales high. This would allow archers to shoot over this area of the wall. When the second row of bales is pulled down, they can begin using pole weapons over the wall. When the final bale row is pulled away, then then the breach allows fighters to pass through the wall at the breach. Third, do not change the battle rules after the fighters muster.
Rule changes during a battle confuse fighters and marshalls.
Please do not subject us to that. Fourth, print the rules on paper for the commanders to study. This helps the commanders to know exactly what the rules are and allows them to relay the rules to their fighters with ease. This also helps to disallow rule changes from happening at any time. This might be an easy outline for a more enjoyable war.