In 1864, some anti-Shogunate samurai, planning to set fire to the residence of Imperial Prince Asahiko and murder Katamori, had Shuntaro FURUTAKA, an arms dealer who also served as a liaison between the Choshu clan and pro-Choshu nobles, procure a large number of weapons.
元治元年（1864年）、一部の尊攘倒幕派は朝彦親王邸への放火や容保の殺害を計画、長州藩と長州派公卿との連絡役でもあった武器商人の古高俊太郎に大量の武器を用意させた。