In the following year Yoshida was confined to his own house at Matsushima, in the province of Cho-shiu, but a year later, in the third of the An-sei era, the discipline was so far relaxed as to admit of his taking pupils for the study of military books. It was probably at this period that he wrote to a Court noble, by name Ohara Shigetami, who held very similar views on the subject of the foreigners’ invasion, begging him to visit Cho-shiu for the purpose of starting an agitation there in favour of the “expulsion of barbarians and the restoration of the Ten-shi to supreme control,” that twofold object on which a majority of the patriots of the age laid stress in the belief that its attainment was wholly indispensable to the welfare of the nation. In truth Yoshida’s teaching of military subjects was little more than a cover for the inoculation of his pupils with the principles of a most resolute antagonism to the Bakufu—_i.e._ the system of government by the Tokugawa line of Sho-guns, a plan of vicarious rule in which he could discern nothing for his country but disaster. A school was at this time opened in the village of Matsushima by two uncles of Yoshida Sho-in, named Kubo and Tamaki, and after a while Yoshida succeeded them in the management thereof; it deserves more than a passing reference, for it was destined to be the cradle, as it were, of the revolution of 1868, by which the present Emperor was led to abandon the life of utter seclusion that it had for centuries been customary for the occupants of the Japanese throne to lead, and to take upon himself the actual rule of his dominions. Among those who attended this school were not a few to whom fell the lot of fighting, a short time afterwards, at Fushimi, in the tremendous contest for supremacy which took place between the adherents of the Sho-gun and those who sided with Choshiu and Satsuma. Yoshida conducted the village school for two years and a half, from July 1856 to December 1858, but in the latter month he was arrested, and thrown into gaol for having, it was alleged, incited his pupils to plot against the Tokugawa dynasty, and planned the assassination, his enemies asserted, of the Minister Manabe Norikatsu, a member of the Government. It is certain, whatever degree of guilt may have attached to him in other respects, that he consistently challenged the wisdom of the Tokugawa’s foreign policy, and advocated most zealously the abolition of that form of administration, becoming in consequence the object of a most determined persecution by the Yedo Government.