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Dating to antiquity, siege towers were large, portable structures that aided soldiers in scaling defensive walls and shielded them as they did so. The massive towers were filled with soldiers and then wheeled up to the walls of a besieged fortress, whereupon gangplanks would be lowered to allow the invading force access. Archers and catapults were often positioned on top of the towers so that they could fire upon enemies during an assault. What protected the wooden towers from flaming arrows? Discuss
Source: The Free Dictionary