In 1941, during World War II, Germany invaded the Soviet Union in Operation Barbarossa. Few days later Continuation War as it is known in Finland (it is considered to be a front of the Great Patriotic War in the Soviet Union and Russia) started. Finland initially regained the lost territory, reaching the Russian side of the border of 1939 and seen by the Russians as indirectly contributing to the Siege of Leningrad (see Finnish reconquest of the Karelian Isthmus (1941)). Some 260,000 Karelian evacuees returned home.