Following the collapse of Tokugawa authority on the mainland, the remnants of the shogunate fleet retreated to the northern island of Ezo under the command of Admiral Enomoto Takeaki. In late 1868, these loyalist forces established the Republic of Ezo, seeking to preserve their political autonomy. The defensive strategy centered on Goryōkaku, a French-designed star fortress in Hakodate that provided superior fields of fire and logistical centralization. Enomoto integrated seasoned samurai infantry with French military advisors to forge a disciplined, modernized defensive line against the advancing Imperial army.
Despite holding a formidable defensive position, the Republic’s survival depended heavily on naval superiority. Recognizing the threat of the Imperial fleet, shogunate forces attempted a daring preemptive boarding operation at the Battle of Miyako Bay. The failure of this naval strike proved strategically catastrophic, as it left the Imperial navy free to transport thousands of troops to Ezo. By May 1869, Imperial forces initiated a comprehensive amphibious assault on Hakodate. The attackers leveraged superior numbers and advanced Armstrong guns to systematically dismantle the outer defensive perimeters.
The Battle of Hakodate rapidly transitioned into a brutal siege. The Imperial forces bombarded Goryōkaku relentlessly, severing supply lines and isolating the defenders. Recognizing the tactical futility of continued resistance and wishing to spare his remaining soldiers, Enomoto capitulated on June 27, 1869. This final surrender extinguished the last vestiges of armed Tokugawa resistance, concluding the Boshin War and cementing the absolute authority of the Meiji government over a unified Japanese archipelago.
