In the Edo period, Masanori FUKUSHIMA who ruled Bingo Province inaugurated a large scale construction of 'the Tomo-jo Castle' by enclosing with the walls the whole town of Tomo with the Tomo-yogai Fortress as the center, but the construction incurred Ieyasu TOKUGAWA's wrath and was thereby cancelled.
江戸時代になると備後国を領有した福島正則によって鞆要害を中心に市街地を取り囲む大規模な城郭「鞆城」の築城が始まるが、これが徳川家康の逆鱗に触れ工事は中止された。