 First established on June 14, 1905, the 4th Fleet was created after the Battle of Tsushima in the Russo-Japanese War specifically to support and cover the landings of Japanese forces in Sakhalin.Afterwards, it was sent to the United States with the Japanese delegation negotiating the Treaty of Portsmouth ending the war, and was disbanded on December 20, 1905.The Fourth Fleet was temporarily resurrected during a war game exercise executed in 1935, playing the role of the opposition force under the command of Hajime Matsushita.