The invasions of Korea launched by the dictator Toyotomi Hideyoshi (1592-1593 and 1597-1598) are unique in Japanese history for being the only time that the samurai assaulted a foreign country. Hideyoshi planned to invade and conquer China, ruled at the time by the Ming dynasty, and when the Korean court refused to allow his troops to cross their country, Korea became the first step in this ambitious plan of conquest. In 1592 a huge invasion force of 150,000 men landed at the ports of Busan and Tadaejin under the commanders Konishi Yukinaga and Kato Kiyomasa. These two Japanese divisions rapidly overran their Korean counterparts, taking the principal cities of Seoul and then Pyongyang and driving the remnants of the Korean Army into China. The Japanese division under Kato Kiyomasa even started to advance into Manchuria.
