淡路島
In January 1868 "Kaiyō Maru" was engaged in the naval battle of Awa off Awaji Island, where she, "Banryū Maru" and "Hazuru Maru" battled against the Satsuma Navy's "Kasuga Maru", "Hōō Maru", and "Heiun Maru". During the battle, "Hōō Maru" was sunk off the coast of Awa.