In 1592 the Japanese invaded Korea. This was their first real effort to set foot on the continent, a purely imperialistic move. Korea, as a Chinese vassal, appealed for Chinese aid. At first the Chinese army had no success, but in 1598 the Japanese were forced to abandon Korea. They revenged themselves by intensifying their raids on the coast of central China; they often massacred whole towns, and burned down the looted houses. The fighting in Korea had its influence on the Tungus tribes: as they were not directly involved, it contributed to their further strengthening. The East India Company was founded in 1600. At this time, while the English were trying to establish themselves in India, the Chinese tried to gain increased influence in the south by wars in Annam, Burma, and Thailand (1594-1604). These wars were for China colonial wars, similar to the colonial fighting by the British in India. But there began to be defined already at that time in the south of Asia the outlines of the states as they exist at the present time. In 1601 the first European, the Jesuit Matteo Ricci, succeeded in gaining access to the Chinese court, through the agency of a eunuch. He made some presents, and the Chinese regarded his visit as a mission from Europe bringing tribute. Ricci was therefore permitted to remain in Peking. He was an astronomer and was able to demonstrate to his Chinese colleagues the latest achievements of European astronomy. In 1613, after Ricci's death, the Jesuits and some Chinese whom they had converted were commissioned to reform the Chinese calendar. In the time of the Mongols, Arabs had been at work in Peking as astronomers, and their influence had continued under the Ming until the Europeans came. By his astronomical labours Ricci won a place of honour in Chinese literature; he is the European most often mentioned.