The Battle of Tsushima (Japanese: 対馬海戦, tsushima-kaisen, Russian: Цусимское сражение, Tsusimskoye srazheniye), commonly known as the “Sea of Japan Naval Battle” (Japanese: 日本海海戦, nihonkai-kaisen) in Japan and the “Battle of Tsushima Strait”, was the major naval battle fought between Russia and Japan during the Russo-Japanese War. This was naval history's only decisive sea battle fought by modern steel battleship fleets,