One day after surrendering at the Battle of Hakodate, Enomoto Takeaki turned the fort of Goryōkaku over to Japanese forces, signaling the collapse of the Republic of Ezo.

The Battle of Hakodate was fought in Japan from December 4, 1868 to June 27, 1869, between the remnants of the Tokugawa shogunate army, consolidated into the armed forces of the rebel Ezo Republic, and the armies of the newly formed Imperial government. It was the last stage of the Boshin War, and occurred around Hakodate in the northern Japanese island of Hokkaidō. In Japanese, it is also known as the Battle of Goryokaku .

Viscount Enomoto Takeaki was a Japanese samurai and admiral of the Tokugawa navy of Bakumatsu period Japan, who remained faithful to the Tokugawa shogunate and fought against the new Meiji government until the end of the Boshin War. He later served in the Meiji government as one of the founders of the Imperial Japanese Navy.

Goryōkaku is a star fort in the Japanese city of Hakodate on the island of Hokkaido. The fortress was completed in 1866. It was the main headquarters of the short-lived Republic of Ezo.

The Republic of Ezo was a short-lived separatist state established in 1869 on the island of Ezo, now Hokkaido, by a part of the former military of the Tokugawa shogunate at the end of the Bakumatsu period in Japan. It was the first government to attempt to institute democracy in Japan, though voting was allowed only to the samurai caste. The Republic of Ezo existed for five months before being annexed by the newly established Empire of Japan.