Russia invaded Finland in November 1939 after the Finns refused to move its border 20 miles west. The war lasted just over three months and, while the Finnish troops were no match for the Red Army, guerrilla tactics curtailed the Soviet advance. The war ended with the Moscow Peace Treaty on 12 November 1940, which saw Finland ceding 9% of territory. Shocked by the ferocity of the defence, however, Stalin abandoned plans to annex the country.
