Republic of Ezo
During the Naval Battle of Hakodate Bay on 26 April 1869, she engaged "Kaiten Maru", firing over 40 shots from her cannon. However, on 11 May she was engaged by the Republic of Ezo paddle schooner "Banryū". A shot from "Banryū" penetrated "Chōyō Maru"′s gunpowder magazine, causing a massive explosion. Some 80 of her crewmen went down with the ship, and the bodies of another six were later recovered from the ocean. However, Captain Nakamura survived the sinking.