To prevent the invasion of enemies, they cleverly used geographical features such as rivers and dug moats, built dirt mounds and rock walls and in important places, there were strong castle gates such as Masugata-mon style gate.
敵の侵攻を妨ぐために、川など地形を巧みに利用するとともに、堀を掘り、土塁や石垣を築き、要所には時として桝形門のような強固な城門を設けることもあった。