Illinois 12th Infantry (Union)
8/1/61
Organized - Illinois 12th Infantry - Illinois
2/11/62
Leadership Change - Regiment - Lieutenant Colonel Augustus L. Chetlain
Lieutenant ColonelAugustus L. Chetlain
2/11/62
Leadership Change - Brigade - Colonel John McArthur
ColonelJohn McArthur
2/11/62
Battle - Fort Donelson - Fort Donelson, Tennessee
Early in the war, Union commanders realized control of the major rivers would be the key to success in the Western Theater.READ MORE
4/6/62
Leadership Change - Regiment - Captain James R. Hugunin, and Lieutenant Colonel Augustus L. Chetlain
CaptainJames R. Hugunin
Lieutenant ColonelAugustus L. Chetlain
4/6/62
Leadership Change - Brigade - Brigadier General John McArthur, and Colonel Thomas Morton
Brigadier GeneralJohn McArthur
ColonelThomas Morton
4/6/62
Leadership Change - Brigade - Brigadier General John McArthur
Brigadier GeneralJohn McArthur
4/6/62
Leadership Change - Division - Brigadier General W.H.L. Wallace
Brigadier GeneralW.H.L. Wallace
4/6/62
Battle - Shiloh - Hardin County, Tennessee
10/3/62
Leadership Change - Regiment - Colonel Augustus L. Chetlain
ColonelAugustus L. Chetlain
10/3/62
Leadership Change - Brigade - Brigadier General Richard J. Oglesby, and Colonel August Mersy
Brigadier GeneralRichard J. Oglesby
ColonelAugust Mersy
10/3/62
Leadership Change - Brigade - Brigadier General Richard J. Oglesby
Brigadier GeneralRichard J. Oglesby
10/3/62
Battle - Battle of Corinth - Corinth, Mississippi
Not to be confused with Siege of Corinth. Also known as Second Battle of Corinth.READ MORE
5/13/64
Battle - Resaca - Gordon County, Georgia; Whitfield County, Georgia
Following his withdrawal from Rocky Face Ridge, the first battle in Maj. Gen. William T. Sherman's campaign against Atlanta, Confederate Gen. Joseph E. Johnston established a four-mile defensive position protecting the Western & Atlantic Railroad west and north of Resaca, where the railroad crossed the Oostanaula River. On May 13th, Sherman tested the Rebel lines, sending forward divisions to skirmish with the Confederates, with little substantive result. On the 14th, the fighting erupted into a full-…READ MORE
7/22/64
Battle - Atlanta - Fulton County, Georgia; DeKalb County, Georgia
Despite the defeat at Peach Tree Creek, Confederate Lieut. Gen. John Bell Hood still had hopes of driving Maj. Gen. William T. Sherman's Yankees from the outskirts of Atlanta with an offensive blow. On the night of July 21, 1864, Hood ordered Lt. Gen. William J. Hardee's corps to make 15-mile night march and assault the Union left flank east of the city, held by Maj. Gen. James B. McPherson's Army of the Tennessee. Joining the attack with Hardee would be the corps of Maj. Gen. Benjamin Cheatham. Hood attac…READ MORE
8/31/64
Leadership Change - Brigade - Colonel Robert N. Adams
ColonelRobert N. Adams
8/31/64
Battle - Jonesborough - Clayton County, Georgia
By late August 1865, the city of Atlanta was not yet subdued by Maj. Gen. William T. Sherman's armies. A few supply lines remained open to the city supporting the army of Lieut. Gen. John B. Hood encircled there. Union cavalry raids inflicted only superficial damage, quickly repaired by the Confederates. Sherman determined that if he could destroy the Macon & Western and Atlanta & West Point Railroads to the south the Rebel army would be forced to evacuate the city. On August 25, Union infantry beg…READ MORE
3/19/65
Battle - Bentonville - Bentonville, North Carolina
After his march to the sea, Maj. Gen. William T. Sherman headed north in early 1865 to unite with Lt. Gen. Ulysses S. Grant's army in Virginia. Only Confederate Gen. Joseph Johnston's army stood between Sherman and Grant. After briefly blocking Sherman's advance at Averasboro, North Carolina on March 16, Johnston struck Maj. Gen. Henry Slocum's wing of Sherman's army near Bentonville on March 19. The Confederates ran into stiff resistance, as Slocum established a defensive position. Johnston's assaults con…READ MORE
7/18/65
Mustered Out - Illinois 12th Infantry - Illinois
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