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After 1858, Katsura Kogorō was based at the domain's Edo residence, where he served as a liaison between the domain bureaucracy and radical elements among the young, lower-echelon Chōshū "samurai" who supported the "Sonnō jōi" movement. Coming under suspicion by the shogunate for his ties with Mito loyalists after the attempted assassination of Andō Nobumasa, he was transferred to Kyōto. However, while in Kyōto, he was unable to prevent the 30 September 1863 coup d'état by the forces of the Aizu and Satsuma domains, who drove the Chōshū forces out of the city.