Translation of "protective wall" into Japanese

It had no Yagura ( turret ) which was usually built on a protective wall .

通常 防壁 上 に 作 ら れ る よう な 櫓 など も な い 。

Within 30 days two more floods came, and there were no protecting walls.

30日以内に洪水がさらに2回起きましたが,防護壁はまったくありませんでした。