main keep of oshi castle in gyoda town, japan

1478 akiyasu ancient architecture asia attack battle besiege built castle citadel culture defense donjon fight fort fortification fortress gyoda historical history invade japan japanese kagawa keep landmark landscape main medieval military narita old oriental oshi prefecture protect reconstructed saitama samurai siege sightseeing site stone stronghold structure tenshu tenshukaku tower town traditional travel turret view wood wooden woodwork