Ryozo fought the Battle of Toba-Fushimi which was known as the first siege of the Boshin Civil War commencing on January 27, 1868, and was eventually killed in the Battle of Hashimoto on January 30th.
慶応4年1月3日（1868年1月27日）から始まった戊辰戦争第一の役鳥羽・伏見の戦いを経て、1月6日（1月30日）に橋本の戦いで戦死。