Langdon began the war serving a major in the 1st Ohio Infantry Regiment which he later led as its lieutenant colonel. He served in battles such as Shiloh, Perryville, Chickamauga, and at Chattanooga's Battle of Missionary Ridge. At the end of the war, he was named a brevet brigadier general with a promotion date of March 13, 1865, and made assessor of internal revenue for the first district of Ohio.[1][2] Langdon had also served as inspector general for General Alexander McDowell McCook's division and corps. He had been severely wounded in the face and neck while leading a successful charge at Missionary Ridge, and would never completely recover from his war wounds. He died suddenly on May 30, 1867, in Cincinnati, Ohio.[3]
^The Photographic History of the Civil War: Three Volumes in One. New York: Random House Value Publishing, Inc. 1983. p. 312. 0-517-20155-0.
^Daniel A. Masters, ed. (2017). Bull Run to Atlanta: The Civil War Letters of Harry Comer, Company A, 1st Ohio Volunteer Infantry. Perrysburg, Ohio: Columbian Arsenal Press. p. 108.
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