As a result of the construction of the two gates, even if an enemy could managed to enter the Masugata enclosure through the first gate, they were prevented from entering the castle ground by the second gate, and were vulnerable to attack in the Masugata area.
攻撃側は桝形内部に侵入しても2番目の門に城内への侵入を阻まれ、桝形内部で守備側からの攻撃を全面に浴びることとなる。