The four-day Naval Battle of Hakodate begins. The newly formed Imperial Japanese Navy defeats the remnants of the Tokugawa shogunate navy in the Sea of Japan off the city of Hakodate, leading to the surrender of the Ezo Republic on May 17.

The Naval Battle of Hakodate was fought from 4 to 10 May 1869, between the remnants of the Tokugawa shogunate navy, consolidated into the armed forces of the rebel Ezo Republic, and the newly formed Imperial Japanese Navy. It was one of the last stages of Battle of Hakodate during the Boshin War,…