板垣退助
From 1868, Tani fought in the Boshin War to overthrow the Tokugawa shogunate, beginning with the Battle of Toba-Fushimi, the Battle of Kōshū-Katsunuma and continuing with the Battle of Aizu. In 1869, he was appointed a junior councilor, and spent the next three years in Tosa, reforming the clan's government, while his fellow clansmen, Itagaki Taisuke and Gotō Shōjirō remained in Tokyo. He spoke out strongly against the profligate spending of the Tosa delegation in Tokyo and enacted cost reduction measures, which enraged Gotō, who had Tani removed. However, this did not solve the underlying problem to the clan's finances, as Tani was returned to his post in April 1871.