9th Illinois Infantry Regiment
Three Month and Three Year Service
3 months: April 26, 1861 - July 25, 1861
3 years: July 26, 1861 - July 9, 1865
The 128th Regiment consolidated with the 9th in April 1864
The 27th Regiment veterans and recruits transferred to the 9th in September, 1864
Regiment Mounted: March 1863 - July 1865

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Assigned to:

• 3 Month Regiment: Duty in Cairo
• District of Cairo: July 1861 - February 1862
• Army of the Tennessee: February 1862 - September 1864

Battles/Campaigns Engaged in:
Ft Donelson, Shiloh, Siege of Corinth, Corinth, Operations against Vicksburg [Central Mississippi Campaign], Atlanta Campaign [Kenesaw Mountain, Peachtree Creek, Jonesborough], March to the Sea, Campaign of the Carolinas [Bentonville]

Adjutant General's Regiment History

Frederick Dyer's Regimental History

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Organization of 3 Month Regiment
9th Infantry Field & Staff	Non-Commissioned Staff
The 3-month regiment did not have a Band, Unassigned Recruits or Unassigned/Substitute/Drafted Recruits

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Link to Roster	Link to County of Origin
Company A Company B Company C Company D Company E Company F Company G Company H Company I Company K	Alexander and St Clair counties St Clair County St Clair County St Clair County St Clair County Sangamon County Madison County Alexander and Montgomery counties Alexander and Madison counties Alexander and Madison counties

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9th Illinois Infantry Regiment  Three Year Service

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Organization of 3 Year Regiment
9th Infantry Field & Staff	Non-Commissioned Staff
The 3-year Regiment did not have a Band, Unassigned or Unassigned/Substitute/Drafted Recruits

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Link to Roster	Link to County of Origin
Company A Company B Company C Company D Company E Company F Company G Company H Company I Company K	Madison County St Clair County St Clair County St Clair & Randolph counties Mercer & St Clair counties St Clair County Jackson, Johnson, & Williamson counties Montgomery County Madison County Pulaski County

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9th (Consolidated) Illinois Infantry Regiment  Consolidated into Battalion of 7 Companies, July 21, 1864

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Consolidated Organization
9th Infantry Field & Staff	Non-Commissioned Staff	Unassigned Recruits
The Consolidated Regiment did not have a Band or Unassigned/Substitute/Drafted Recruits

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Link to Roster

Company A (Consolidated) Company B (Consolidated) Company C (Consolidated) Company D (Consolidated) Company E (Consolidated) Company F (Consolidated) Company G (Consolidated)

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