The Winter War was a war between the Soviet Union and Finland. It began with a Soviet invasion of Finland on 30 November 1939, three …

Until the early 19th century, Finland was the eastern part of the Kingdom of Sweden. From 21 February 1808 to 17 September 1809, the Russian Empire waged the Finnish War against the Kingdom of Sweden, ostensibly to protect the Russian capital, …

Before the war, Soviet leadership had expected total victory within a few weeks. The Red Army had just completed the invasion of eastern Poland at a cost of fewer than 4,000 casualties after Germany attacked Poland from the west. Stalin's e…

On 30 November 1939, Soviet forces invaded Finland with 21 divisions, totalling 450,000 men, and bombed Helsinki, killing about 100 citizens and destroying more than 50 buildings. In response to international criticism, Soviet Foreign Min…

The winter of 1939–40 was exceptionally cold with the Karelian Isthmus experiencing a record low temperature of −43 °C (−45 °F) on 16 January 1940. At the beginning of the war, only those Finnish soldiers who were in active service had uniforms and we…

The USSR enjoyed air superiority throughout the war. The Soviet Air Force, supporting the Red Army's invasion with about 2,500 aircraft (the most common type being Tupolev SB), was not as effective as the Soviets might have hoped. The material …