Lake Ladoga Stolbovo, the northern and western coast was ceded by Russia to Sweden. In 1721, after the Great Northern War, it was restitution to Russia by the Treaty of Nystad. Later, in 1812–1940 the lake was shared between Finland and Russia. According to the conditions of the 1920 Tartu Peace Treaty militarization of the lake was severely restricted. However, both Soviet Russia and Finland had flotillas in Ladoga (see also Finnish Ladoga Naval Detachment). After the Winter War (1939–40) according to the Moscow Peace Treaty, Ladoga, previously shared with Finland, became an internal basin of the Soviet Union. During the Continuation
Finnish reconquest of Ladoga Karelia (1941) Finnish reconquest of Ladoga Karelia (1941) The Finnish reconquest of Ladoga Karelia (1941) refers to a military campaign carried out by Finland in 1941. It was part of Operation Barbarossa, Nazi Germany's invasion of the Soviet Union. It is commonly discussed as part of the Continuation War. Initially the Finnish army was deployed in a defensive posture, but on June 29 Mannerheim created the Army of Karelia, commanded by Lt. Gen. Erik Heinrichs, and ordered it to prepare to attack Ladoga Karelia. The Army of Karelia consisted of VI Corps (5th and 11th Divisions), VII Corps (7th and 19th divisions)