Some members of Hisamitsu's clan who advocated sonjo party (royalists) misunderstood Hisamitsu's action as preparation to overthrow the bakufu, but they were suppressed by Hisamitsu (See the Teradaya incident), and his efforts with the Court worked, and Shigenori OHARA was sent as an imperial messenger to the bakufu.
この動きを倒幕への準備と見誤った同藩の尊攘派が久光によって鎮圧される事件が発生したものの（寺田屋騒動参照）、久光の朝廷工作により、幕府改革への勅使として大原重徳が遣わされるという事態となる。