And as for technique of castle construction, battlement for a flank attack (it had already existed), exploiting the performance of hinawaju, developed and they were applied to Ako-jo Castle.
また、築城技術でも火縄銃の性能を活かした横矢掛かり（これ自体はすでに存在していた）などが発達し、赤穂城などに応用された。