 Unable to achieve more than 3 knots due to engine trouble, the "Kaiten No.2" trailed behind, and the "Kaiten No.1" first joined battle.The "Kaiten No.1" approached the enemy ships and raised the Tokugawa banner seconds before boarding the French-built "Kōtetsu", of the opposing Imperial navy (the first Japanese ironclad).The "Kōtetsu" managed to repel the attack with a Gatling gun, with huge loss on the attacking side.