This book describes the operations of the Soviet air force along the Finnish-Soviet front during the Winter War of 1939-1940. The Winter War began with the Soviet invasion of Finland on 30 November 1939, three months after the outbreak of World War II, and ended three and a half months later with the Moscow Peace Treaty on 13 March 1940. The League of Nations deemed the attack illegal and expelled the Soviet Union from the organisation. The book includes over 350 photographs, most of which have never published before, 28 specially commissioned colour profiles and 5 maps. An essential book for any student of Soviet aviation history.