The Battle of Viborg Bay (in Swedish literature known as Viborgska gatloppet, "the Viborg gauntlet") was a naval battle fought between Russia and Sweden on July 4, 1790, during the Russo-Swedish War (1788-1790). The Swedish Navy suffered heavy losses, losing six ships of the line and four frigates, but Gustav III of Sweden eventually ensured a Swedish naval escape through a Russian naval blockade composed of units of the Baltic Fleet, commanded by Admiral Vasili Chichagov. The battle ranks among the world's largest historical naval battles and also among the most influential, as it introduced the naval battle concept of "firepower over mobility".