The castle sites used as garrisons were targeted by the United States Armed Forces during the Pacific War (The Greater East Asia War) and citadel constructions, such as castle towers, turrets and gates of Nagoya-jo Castle, Wakayama-jo Castle and Hiroshima-jo Castle, which were built before the Edo period, were burnt out in air raids or with atomic bombs.
それら駐屯地となった城跡は、太平洋戦争（大東亜戦争）中にアメリカ合衆国軍の標的とされ、空襲や原子爆弾等により、名古屋城、和歌山城、広島城などの天守や櫓、門など、多くの現存していた江戸時代以前の城郭建築が損失した。