Genpei War: The Battle of Mizushima takes place off the Japanese coast, where Minamoto no Yoshinaka's invasion force is intercepted and defeated by the Taira clan.

The naval battle of Mizushima took place on 17 November 1183 during the Genpei War. One of the most important bases of the Taira was Yashima, a small island off the coast of Shikoku. In November 1183, Minamoto no Yoshinaka sent an army to cross the Inland Sea to Yashima, but they were caught by the Taira just offshore of Mizushima (水島), a small island of Bitchu Province, just off Honshū. The Taira tied their ships together and placed planks across them to form a flat fighting surface.