 He also supported the Tokugawa shogunate, and was given the position of "Ōbangashira" in 1863.In 1864, he received an order to pursue and suppress the Mito Rebellion, but the orders were cancelled five days later, and he was ordered instead to strengthen public security within Edo.In December 1867 he rose to the position of "wakadoshiyori" and was simultaneously appointed "Gaikoku Sō-Bugyō" (Foreign Affairs Magistrate).However, in January 1868 he committed suicide by drowning within Edo Castle as a gesture of protest against the surrender of the office of Shogun by Tokugawa Yoshinobu.