1869/5/11, the Imperial troops attacked Hakodate. They had 7 ships to support the ground troops but one of them ''[[Choyo maru|Chôyô maru]]'' was sunk by Banryô maru. | 1869/5/11, the Imperial troops attacked Hakodate. They had 7 ships to support the ground troops but one of them ''[[Choyo maru|Chôyô maru]]'' was sunk by Banryô maru. |