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Regiment mustered in on November 23rd, 1861.

Regiment mustered out of service on July 7th, 1865.

Notable Battles:

Ruff's Mill fought on July 4th, 1864 near Concord Road, Georgia
Mount Zion Church fought on December 28th, 1861 near Boone County, Missouri
Roan's Tan Yard fought on January 8th, 1862 near Randolph County, Missouri
Fort Donelson fought on February 11th, 1862 - February 16th, 1862
Shiloh fought on April 6th, 1862 - April 7th, 1862 near Hardin County, Tennessee
Siege of Corinth fought on April 29th, 1862 - May 30th, 1862
Iuka fought on September 19th, 1862 near Tishomingo County, Mississippi
Battle of Corinth fought on October 3rd, 1862 - October 4th, 1862 near Corinth, Mississippi
Corinth fought on October 3rd, 1862 - October 4th, 1862
Resaca fought on May 13th, 1864 - May 16th, 1864 near Gordon County, Georgia; Whitfield County, Georgia
Lay's Ferry fought on May 14th, 1864 near Lays Ferry, Georgia
Rome Cross Roads fought on May 16th, 1864 near Gordon County, Georgia, Georgia
New Hope Church fought on May 25th, 1864 - May 26th, 1864 near Paulding County, Georgia
Dallas fought on May 27th, 1864 - June 4th, 1864 near Paulding County, Georgia
Kennesaw Mountain fought on June 27th, 1864 near Cobb County, Georgia
Atlanta fought on July 22nd, 1864 near Fulton County, Georgia; DeKalb County, Georgia
Lovejoy's Station fought on August 20th, 1864 near Clayton County, Georgia
Jonesborough fought on August 31st, 1864 - September 1st, 1864 near Clayton County, Georgia
Second Fort McAllister fought on December 13th, 1864 near Bryan County, Georgia
Congaree Creek fought on February 15th, 1865 near Congaree Creek, South Carolina
Bentonville fought on March 19th, 1865 - March 21st, 1865 near Bentonville, NC

Regiment was made up of:

Company A
Company B
Company C
Company D
Company E
Company F
Company G
Company H
Company I
Company K
Company F&S (Field and Staff)

Commander List: (#Prisoner Of War, ^Wounded, %=Died during war)

Alexander, James M. (Chaplain, September 1861 - June 1863)
Campbell, Andrew K. (Major, January 1863 - January 1864; Lieutenant Colonel, January 1864 - May 1864; Colonel, May 1864 - July 1865)
Fitch, George W. (%Assistant Surgeon/First Assistant Surgeon, December 1863 - April 1864)
Frohock, William Thompson (Colonel/Full Captain/Full Colonel/Brigadier General/Captain, January 1864 - September 1864)
Hartzell, Abraham (Chaplain, March 1864 - June 1865)
McCord, David O (Surgeon, October 1863 - January 1866)
Moon, Wanton G. (Commissary Sergeant, September 1862 - June 1864)
Pipe, George (Major, April 1862 - January 1863)
Pogue, Joseph (Surgeon, March 1862 - July 1865)
Reed, Fitzhugh (Comm Sergeant, December 1863 - February 1865; Quartermaster, February 1865 - July 1865)
Rosebery, James S. (Hospital Steward, October 1861 - October 1864)
Stephenson, Robert A. (Assistant Surgeon, May 1864 - June 1865)
Young, John W. (Assistant Surgeon/Surgeon, April 1862 - August 1862)

Illinois 66th Infantry (Union)

Illinois, United States of America

Companies

Field Officers