After the defeat in Kizu-gawa River, Nobunaga told Yoshitaka KUKI, the leader of the Kuki navy, to build unburnable ships so that Yoshitaka had been developing armored warships with the exterior covered with iron plates.
木津川での敗戦後、信長は九鬼水軍の長である九鬼嘉隆に燃えない船を造るように命じ、嘉隆は船の外装に鉄板を貼った鉄甲船の建造を進めていた。