Battle of the Japan Sea (Japanese: 日本海大海戦, Hepburn: Nihonkai Daikaisen, lit. 'The Great Battle in the Japan Sea') is a 1969 Japanese war film directed by Seiji Maruyama, with special effects by Eiji Tsuburaya. The film stars Toshiro Mifune, Yūzō Kayama, Tatsuya Nakadai, Toshio Kurosawa, Makoto Satō, Ryutaro Tatsumi, Chishū Ryū, and Matsumoto Kōshirō VIII. It focuses on Japan during the Russo-Japanese War. In the course of the battle, both the Japanese navy and army fail in their attempts to seize Port Arthur, and a Russian fleet bears down on the Japanese sea.