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The castle's main gatehouse served as the focal point for defensive strategies. Reinforced with towers flanking the entrance and multiple portcullises, these structures were engineered to ensnare attackers in kill zones, where defenders could utilize murder holes for retaliatory measures. The gatehouses of the thirteenth century, particularly those built by Edward I in Wales, reflected increasingly advanced defensive technology, epitomizing the castle's role as both a residence and a military complex.