Invasion of Ryukyu

The invasion of Ryukyu (琉球侵攻, Ryūkyū Shinkō) by forces of the Japanese feudal domain of Satsuma took place from March to May of 1609, and marked the beginning of the Ryukyu Kingdom's status as a vassal state under the Satsuma domain. Former Satsuma territories that had been invaded by the Ryukyu Kingdom, such as the Amami Islands, were reintegrated into the Satsuma domain.