This roster includes the known officers and enlisted men of the 1st Indiana Heavy Artillery (originally organized as the 21st Indiana Infantry), 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 1st Indiana Heavy Artillery, these resources may provide additional historical detail, including regimental histories and Civil War reference works.
Field & Staff
- Colonel James W. McMillan – Promoted to brigadier-general, November 29, 1862.
- Colonel John A. Keith – Promoted from lieutenant colonel.
- Colonel Benjamin F. Hayes – Promoted from major and lieutenant colonel.
- Lieutenant Colonel William Roy – Promoted from major.
- Lieutenant Colonel James W. Connelly – Promoted from major.
- Major Benjamin F. Hayes – Later promoted.
- Major William Roy – Later promoted.
- Major James Grimsley
- Major Edward McLaflin
- Major John W. Day
- Major James W. Connelly
- Major Isaac C. Hendricks
- Major Samuel E. Armstrong
Company A
Records for this company are incomplete in the surviving state adjutant general reports.
Company B
Records for this company are incomplete in the surviving state adjutant general reports.
Company C
Records for this company are incomplete in the surviving state adjutant general reports.
Company D
Records for this company are incomplete in the surviving state adjutant general reports.
Company E
Records for this company are incomplete in the surviving state adjutant general reports.
Company F
Records for this company are incomplete in the surviving state adjutant general reports.
Company G
Records for this company are incomplete in the surviving state adjutant general reports.
Company H
Records for this company are incomplete in the surviving state adjutant general reports.
Company I
Records for this company are incomplete in the surviving state adjutant general reports.
Company K
Records for this company are incomplete in the surviving state adjutant general reports.
Company L
Records for this company are incomplete in the surviving state adjutant general reports.
Company M
Records for this company are incomplete in the surviving state adjutant general reports.
Non-Commissioned Staff
Some details are incomplete in surviving primary sources.
Unassigned Recruits
Unassigned recruits were reported in state records, but individual names and assignments are incomplete in available sources.
Consolidations or Transfers
In February 1863, the regiment was transferred from infantry to heavy artillery service and designated as the 1st Indiana Heavy Artillery. Two additional companies were organized and attached later in the year. Some companies served detached at various posts in the Department of the Gulf.
Sources & Notes
- Official Records of the War of the Rebellion, Series I, various volumes and parts covering operations in the Department of the Gulf.
- State Adjutant General Report for Indiana (multiple years; see volumes for 1861–1866 for rosters and service notes).
- Dyer’s Compendium.
- Fox, “Regimental Losses in the American Civil War.”
- The Union Army, Federal Publishing Company, 1908, Volume 3.