Fought on the 27th-28th May 1905, the Battle of Tsushima was the major naval battle of the Russo-Japanese War which resulted in the crushing defeat of the Russian fleet and the destruction of two thirds of its warships. This defeat is widely understood to be one of the immediate causes of the Russian Revolution that year.
Pictured here, in an early photograph from the 27th May 1905, the Japanese Combined Fleet can be seen advancing towards the Baltic Fleet.
To read about the Russo-Japanese War in detail why not grab a copy of Geoffrey Jukes' The Russo-Japanese War 1904–1905 from our Essential Histories series?
The original image can be viewed here.