Satchō Alliance
During the Bakumatsu period, Kuwana was ruled by Matsudaira Sadaaki, key supporter of the Tokugawa clan in the Boshin War. However, in his absence while fighting the Satchō Alliance in northern Japan, the castle was surrendered to without a battle. It was set on fire by troops of the Meiji government and after the Meiji Restoration, its stone walls were demolished to form part of the breakwater at Yokkaichi Port.