The history of Electronic Warfare goes back to at least the beginning of the 20th century. The earliest documented consideration of EW was during the Russo-Japanese War of 1904–1905. The Japanese auxiliary cruiser, Shinano Maru, had located the Russian Baltic Fleet in Tsushima Strait, and was communicating the fleet's location by "wireless" to the Imperial Japanese Fleet HQ. The captain of the Russian warship, Orel, requested permission to disrupt the Japanese communications link by attempting to transmit a stronger radio signal over the Shinano Maru's signal hoping to distort the Japanese signal at the receiving end. Russian Admiral Zinovy Rozhestvensky refused the advice and denied the Orel permission to electronically jam the enemy, which in those circumstances might have proved invaluable. The intelligence the Japanese gained ultimately led to the decisive Battle of Tsushima. The battle was humiliating for Russia. The Russian navy lost all their battleships and most of its cruisers and destroyers. These staggering losses effectively ended the Russo-Japanese War in Japan's favor. 4,380 Russians were killed and 5,917 were captured, including two admirals, with a further 1,862 interned.