Which mechanism decreased siege tower effectiveness during the Roman-Persian Wars due to improved fortress defense?

💡 Explanation

When fortress defenses incorporated reinforced stone and deeper moats, ranged attacks became key, because the increased range of composite bows outpaced the siege towers' protection, causing high casualty rates among the attacking soldiers within. Therefore, composite bow range increase decreased tower effectiveness leading to changes in seige tactics, rather than weaknesses of ballista, flammability, or catapult aiming.

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