This roster includes the known officers and enlisted men of the 9th Ohio Cavalry (Three Years’ Service), organized by Field & Staff and Companies A through M. Information is drawn from 19th-century state adjutant general reports, the Official Records, and verified regimental histories.
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For an overview of this regiment’s organization, service, engagements, and casualties, see the regiment summary page.
Research This Regiment
If you’re researching ancestors in the 9th Ohio Cavalry (Three Years’ Service), these resources may provide additional historical detail, including regimental histories and Civil War reference works.
Field & Staff
- Colonel William D. Hamilton – Commanded regiment; mustered in 1863.
- Lieutenant Colonel Thomas P. Cook – Promoted from Major; served as second-in-command.
- Lieutenant Colonel William Stough – Promoted from Major; served as second-in-command.
- Major William Sims – Mustered in 1863; later promoted.
- Major John Williamson – Mustered in 1863; later promoted.
- Major Henry Plessner – Mustered in 1863; later promoted.
- Major Elijah Hogue – Mustered in 1863; later promoted.
- Major Lewis H. Bowlus – Mustered in 1863; later promoted.
- Major John W. Macumber – Mustered in 1863; later promoted.
- Major James Irvine – Mustered in 1863; later promoted.
Company A
Some details are incomplete in surviving primary sources.
Company B
Some details are incomplete in surviving primary sources.
Company C
Some details are incomplete in surviving primary sources.
Company D
Some details are incomplete in surviving primary sources.
Company E
Some details are incomplete in surviving primary sources.
Company F
Some details are incomplete in surviving primary sources.
Company G
Some details are incomplete in surviving primary sources.
Company H
Some details are incomplete in surviving primary sources.
Company I
Some details are incomplete in surviving primary sources.
Company K
Some details are incomplete in surviving primary sources.
Company L
Some details are incomplete in surviving primary sources.
Company M
Some details are incomplete in surviving primary sources.
Sources & Notes
- Official Records of the War of the Rebellion, Series I, relevant volumes and parts.
- State Adjutant General Report for Ohio (years 1863–1865; volumes and pages as available).
- Dyer’s Compendium.
- Fox, “Regimental Losses in the American Civil War.”
- The Union Army, Federal Publishing Company, 1908, Volume 2.