was a general in the Imperial Japanese Army and Army Minister during World War I. His son, Hiroshi Ōshima was a lieutenant general in the Imperial Japanese Army, and served as Japanese ambassador to Nazi Germany.
Biography Ōshima was born in Iwamura Domain, Mino Province (currently part of Ena City in Gifu Prefecture) as the son of a samurai household. He graduated from the 4th class of the Imperial Japanese Army Academy in 1881, where he specialized in artillery and was sent overseas as a military attaché and for studies to France and Prussia from 1891 to 1893.
Ōshima served on the staff of General Yamagata Aritomo during the Japanese First Army in First Sino-Japanese War. During the Russo-Japanese War, he served on the Imperial General Headquarters, and after the war held various administrative and staff positions within the Imperial Japanese Army General Staff. He was promoted to major general in 1907 and to lieutenant general in 1913.
From 30 April 1916 to 29 September 1918, Ōshima was Minister of War under Prime Ministers Ōkuma Shigenobu and Terauchi Masatake.Wendel, Axis History Factbook He entered the reserves in 1919 and served as a member of the House of Peers in the Diet of Japan from 1920. From 1940 to 1946, he served as a member of the Privy Council.
Decorations 1895 – Order of the Sacred Treasure, 6th class 『官報』第3578号「叙任及辞令」June 5, 1895 1895 – Order of the Rising Sun, 6th class 『官報』第3693号「叙任及辞令」October 19, 1895 1895 – Order of the Golden Kite, 5th class 『官報』第3693号「叙任及辞令」October 19, 1895 1900 – Order of the Sacred Treasure, 5th class 『官報』第5072号「叙任及辞令」June 1, 1900 1905 – Order of the Sacred Treasure, 4th class 『官報』第6627号「叙任及辞令」August 2, 1905 1906 – Order of the Rising Sun, 3rd class 1908 – Order of the Golden Kite, 3rd class 『官報』第7514号「叙任及辞令」July 14, 1908 1908 – Order of the Rising Sun, 2nd class 『官報』第5487号「叙任及辞令」October 15, 1901 1916 – Grand Cordon of the Order of the Sacred Treasure 『官報』第1038号「叙任及辞令」January 20, 1916 1916 – Grand Cordon of the Order of the Rising Sun『官報』第1187号「叙任及辞令」January 15, 1916 1920 – Order of the Rising Sun: Grand Cordon of the Paulownia Flowers『官報』第1187号「叙任及辞令」May 21, 1921
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