井伊直弼
By 1858, Ii Naosuke, the bakufu Tairō who signed treaties with the Western powers, began to round up sonnō jōi rebels in Kyōto, Edo, and eventually the provinces. Many of Yoshida Shoin's followers were caught up in the dragnet. That year, Yoshida Shōin put down the brush and took up the sword. When Ii Naosuke sent a servant to (unsuccessfully) ask the emperor to support one of his treaties with the foreigners, Yoshida Shōin led a revolt, calling on "rōnin" to aid him, but received very little support. Nonetheless, he and a small band of students attacked and attempted to kill Ii's servant in Kyoto. The revolt failed, and Yoshida Shoin was again imprisoned in Chōshū.