 Complete the following phrase:  During the Seven Years War, 17561763, the Russian Baltic Sea fleet was active on the Pomeranian coast of northern Germany and Prussia, helping the infantry to take Memel in 1757 and Kolberg in 1761. The Oresund was blockaded in order to prevent the British Navy from entering the Baltic sea. During the Russo-Swedish War 17881790 the fleet, commanded by Samuel Greig, checked the Swedes 