蝦夷共和國
In 1868, with the start of the Boshin War, Karatsu Domain remained strongly in support of the Tokugawa bakufu. Karatsu domain was a "fudai" domain, unlike the neighboring Nabashima domains, which were of "tozama" domain status. The Ogasawara remained loyal to the Tokugawa to the end, with Nagamichi and many samurai accompanying the remnants of the Tokugawa army north to join the Northern Alliance and then the Republic of Ezo, fighting in the Battle of Hakodate.