 She did not actively participate in many operations, since the heavier Soviet naval units never left Leningrad, where they were used as floating batteries during the siege.As a result, "Väinämöinen"s primary operational duties were to patrol the Gulf of Finland between the minefields ""Seeigel"" and ""Nashorn"", as well as protection of the German-Finnish anti-submarine net across the gulf.During the Soviet assault in the summer of 1944, the Soviets put much effort into trying to find and sink "Väinämöinen".