Later, Tokugawa Ieyasu launched two campaigns in summer and winter. He defeated the Toyotomi clan, and destroyed Osaka Castle. In 1620, however, the second generation general of Tokugawa Shogun, Tokugawa Hideto, rebuilt the "surrounded city". The core building of Osaka Castle is the castle tower in the centre of the city. It looks like five floors, but there are actually eight floors. The top floor of the castle tower overlooks the bustling city of Osaka. From its appearance, the architectural style of the castle tower and the main building of Kumamoto Castle and Nagoya City are printed like a mould. The Tengwang Pavilion in Nanchang, Jiangxi is also very similar, once again confirming the historical statement that Japanese culture originated from Chinese culture.