In 1915 he moved to Germany where he started his military education. During the Civil war in Soviet Russia in 1918 Aarne commanded the front in Karelia between Saimen and Ladoga lake. His military operations as a part of Karelian army concluded to holding a position south of Vuoksen. His youth, his backgraund as a hunter and his speaking Finnish made him an alternaive to Gustaf Mannerheim. But despite his successful initial career he left the Army in 1918 because he couldn't come to terms with German orientation. He was an adherent of Republic unlike with many advocates of monarсhy of his country. Aarne Sihvo had run as a candidate for parliamentary elections in 1919 as a member of the National Progressive Party and took the mayority of votes in his district. Sihvo was born in Virolahti and died, aged 73, in Helsinki. He is buried in the Hietaniemi Cemetery in Helsinki.
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