Invasion of Ryukyu

The invasion of Ryukyu (琉球征伐, Ryūkyū Seibatsu) by forces of the Japanese feudal domain of Satsuma took place in 1609, and marked the beginning of the Ryūkyū Kingdom's status as a vassal state under Satsuma. The invasion itself involved few casualties, as Ryukyu had little military strength, and its people were ordered by their king to surrender and to spare themselves any bloodshed.

• http://en.wikipedia.org/wiki/Invasion of Ryukyu