(5 September 1900 – 12 June 1944) was a Finnish colonel and historian.
Hannula was born in Turku. After studying at a military college in the 1920s, he joined the Finnish army, serving in the Uusimaa regiment and as a first division staff officer. He was a lecturer in the history of war at Finland's academy of military sciences from 1927 to 1939. He returned to active service as the commanding officer of a regiment and a brigade, and died at Salla in an air raid during the Continuation War of 1941–1944.
Bibliography Clausewitz sotateoreetikkona (1927) Napuen taistelu (1929) Itäarmeijan operaatioiden suunnittelu ja johto v. 18 (1932) Sotataidon historia (3 parts, 1933) Maailmansodan historia (2 parts, 1935–1936) Hakkapeliittoja ja karoliineja (1939) Suomi taistelee (3 parts, with B. Fagerström och B. Sandberg, 1940)
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