During the Boshin War, Katamori and the Aizu han fought against the Meiji Government armies, but were severely defeated. Katamori's life was spared, and he later became the Chief of the Tōshōgū Shrine. He, along with his three brothers Sadaaki, Yoshikatsu, and Mochiharu, had highly influential roles during the Meiji Restoration and were called the four Takasu brothers (Takasu yon-kyōdai 高須四兄弟).