The Battle of Tsushima, also known in Japan as the Battle of the Sea of Japan , was the final naval battle of the Russo-Japanese War, fought on 27–28 May 1905 in the Tsushima Strait. A devastating defeat for the Imperial Russian Navy, the battle was the only decisive engagement ever fought between modern steel battleship fleets and the first in which wireless telegraphy (radio) played a critically important role. The battle was described by contemporary Sir George Clarke as "by far the greatest and the most important naval event since Trafalgar".

Zinovy Petrovich Rozhestvensky was a Russian admiral of the Imperial Russian Navy. He was in command of the Second Pacific Squadron in the Battle of Tsushima, during the Russo-Japanese War.