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Thomas Ogden Osborn
Personal Information
Born: August 11, 1832(1832-08-11)
Place of Birth: {{{place of birth}}}
Died: March 27, 1904 (aged 71)
Place of Death: {{{place of death}}}
Nickname: {{{nickname}}}
Birth Name: {{{birth name}}}
Other Information
Allegiance: United States of America
Participation(s): {{{participations}}}
Branch: Union Army
Service Years: {{{service years}}}
Rank: Brevet Major General
Service number : {{{servicenumber}}}
Unit: Army of the James
Commands: 1st Brigade, 1st Division, XXIV Corps
Battles: American Civil War
Awards: {{{awards}}}
Other work: {{{otherwork}}}

Thomas Ogden Osborn (August 11, 1832  – March 27, 1904) was an American lawyer, soldier, and diplomat who served as a general in the Union Army during the American Civil War. He was also the U.S. Minister to Argentina from 1874–85.

Early life and career[]

Thomas Osborn was born near the rural village of Jersey in Licking County, Ohio.[1] In 1854 he graduated from Ohio University at Athens. Osborn studied law under future Civil War general Lew Wallace and moved to Chicago, where he established a law practice in 1858.[2]

Civil War service[]

After the start of the war, Osborn became the lieutenant colonel of the 39th Illinois Infantry on October 11, 1861, and was promoted to colonel the following year on January 1. He led the regiment in several campaigns and battles in the Eastern Theater.[3]

Osborn and his command saw action in the 1862 Valley Campaign against Confederate forces under Lt. Gen. Thomas Jonathan "Stonewall" Jackson, participating in the Battle of Port Republic on June 9. From July until September 1863, Osborn took part in Union operations against Charleston, South Carolina, including attacks on Fort Wagner and Fort Sumter.

In 1864, Osborn commanded the 1st Brigade, 1st Division of the XXIV Corps of the Army of the James.[4] Osborn was badly wounded at the Battle of Drewry's Bluff on May 14, 1864, when a musket ball shattered his right elbow and lodged in his arm. He stayed in the hospital until September before being released for duty. In December, he had recovered enough to report for duty. However, he suffered from ankylosis of the injured elbow for the rest of his life.[5]

File:T O Osborn staff ACW.jpg

Osborn (seated, left) and his staff during the American Civil War

During the Siege of Petersburg in 1864 into 1865, Osborn led a brigade in the XXIV Corps. He was brevetted to the rank of brigadier general on March 10, 1865.[6]

On April 2, 1865, Osborn's command was instrumental in the capture of Fort Gregg during the Union breakthrough, and he brevetted to major general to rank from that date.[3] He was promoted to brigadier general in the regular army on May 1, 1865, and led the 1st Division of the XXIV Corps from May 2 – July 8. Olson resigned from the army on September 28.[6]

Postbellum career[]

Osborn returned to his legal practice in Chicago, engaged in several business ventures, and he also held several Federally-appointed position. He was elected as the treasurer of Cook County, Illinois, serving from 1867 until 1869.[3] He entered the State Department in 1874 after receiving a presidential appointment as the U.S. Minister to Argentina. He served in Buenos Aires until 1885.[7] He was significant involved in the negotiations to the Boundary treaty of 1881 between Chile and Argentina[8].

In the spring of 1904, Osborn died in Washington, D.C., after suffering for ten hours from a massive cerebral hemorrhage that paralyzed him.

He is buried in Arlington National Cemetery.[6]

See also[]

32x28px United States Army portal
32x28px American Civil War portal


  • Eicher, John H., and Eicher, David J., Civil War High Commands, Palo Alto, California: Stanford University Press, 2001, ISBN 0-8047-3641-3.
  • Heidler, David S., and Heidler, Jeanne T., eds., Encyclopedia of the American Civil War: A Political, Social, and Military History, W. W. Norton & Company, 2000, ISBN 0-393-04758-X.
  • U.S. War Department, The War of the Rebellion: a Compilation of the Official Records of the Union and Confederate Armies, U.S. Government Printing Office, 1880–1901.
  • Warner, Ezra J., Generals in Blue: The Lives of the Union Commanders, Louisiana State University Press, 1964, ISBN 0-8071-0822-7.
  • Welsh, Jack D., Medical Histories of Union Generals, Kent State University Press, 2005, ISBN 978-0873386494.


  1. Ohio Civil War Trails 2 Retrieved 2008-10-21.
  2. Warner, p. 351.
  3. 3.0 3.1 3.2 Warner, p. 352.
  4. Osborn's brigade consisted of the 39th Illinois Infantry, 62nd Ohio Infantry, 67th Ohio Infantry, 85th Pennsylvania Infantry, and the 199th Pennsylvania Infantry regiments.
  5. Welsh, p. 246.
  6. 6.0 6.1 6.2 Eicher, p. 411.
  7. The Political Graveyard Retrieved 2008-10-21.
  8. See Los esfuerzos de la diplomacia norteamericana para obtener la ratificación del Tratado de 1881:
    "Los respectivos signatarios deberíamos expresar, en este acto y en el nombre de sus respectivos gobiernos, el profundo aprecio hacia la benévola asistencia con la que sus Excelencias, los Ministros de Estados Unidos acreditados en la República Argentina y en la de Chile, el mayor general Thomas O. Osborn y Mr. Thomas A. Osborn, contribuyeron a las negociaciones que llevaron al acuerdo definitivo y que ha sido firmado gracias a ellos"'

External links[]