This book describes the war between the USSR and Finland, which began on November 30, 1939 and lasted 105 days. However, despite its transience, it became one of the most tragic pages in the recent history of both countries. The Soviet Union did not expect to meet Finnish resistance, but they proved to be worthy opponents, and one of the most difficult military campaigns of World War II began. Both sides suffered huge losses. And in all likelihood, it was this campaign that influenced the further development of World War II.