As a consequence of this state of affairs, a few serious collisions took place between the foreigners and the two-sworded samurai, retainers of the clan-rulers. The Tokugawa rulers apparently did their best to protect the foreigners, and, when there was no possible method of evasion, to execute the treaties they had made. But they could not control the clans already rebellious. A few murders of foreigners, followed by severe reprisals, and two bombardments of native towns by foreign gunboats, began to reveal to the military class at large that no individual or local action against the foreigners was at all to be thought of. The first step necessary was the unification of the Empire under the Imperial rule. This, however, could be done only by the overthrow of the Tokugawa Shogunate; which was effected in 1867-68 after a short struggle, marked by great clemency. We thus realize that the overthrow of the Shogunate as also the final abolishment of feudalism with its clans, lords, and hereditary rulers, and the establishment of those principles of political and personal centralization which lie at the foundation of real national unity, not only were hastened by, but in a marked degree dependent on, the stimulus and contribution of foreigners. They compelled a more complete Japanese unity than had existed before, for they demanded direct relations with the national head. And when treaty negotiations revealed the lack of such a head, they undertook to show its necessity by themselves punishing those local rulers who did not recognize the Tokugawa headship. With the establishment of the Emperor on the throne, began the modern era in Japanese history, known in Japan as "Meiji"--"Enlightened Rule."