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Simo Häyhä, often referred to by his nickname, The White Death, was a Finnish military sniper during World War II in the 1939–1940 Winter War between Finland and the Soviet Union. He used a Finnish-produced M/28-30 rifle and a Suomi KP/-31 submachine gun. Häyhä is believed to have killed over 500 enemy soldiers during the conflict, the highest number of sniper kills in any major war. Consequently, he is often regarded as the deadliest sniper in history. Häyhä estimated in his private war memoir that he shot around 500 Soviet soldiers. The memoir, titled Sotamuistoja, was written in 1940, a few months after he was wounded, and described his experiences in the Winter War from 30 November 1939 to 13 March 1940. Hidden for decades, the memoir was discovered in 2017.