125th Illinois Volunteer Infantry Regiment The 125th Illinois Volunteer Infantry was an infantry regiment in the Union Army during the American Civil War . Service . The 125th Illinois Infantry was organized at Danville , Illinois and mustered in for three years service on September 3 , 1862 under the command of Colonel Oscar Fitzalan Harmon . The regiment was attached to 36th Brigade , 11th Division , Army of the Ohio , to October 1862 . 36th Brigade , 11th Division , III Corps , Army of the Ohio , to November 1862 . 2nd Brigade , 4th Division , Centre , XIV Corps , Army of the Cumberland , to January 1863 . 2nd Brigade , 4th Division , XIV Corps , to June 1863 . 2nd Brigade , 2nd Division , Reserve Corps , Army of the Cumberland , to October 1863 . 3rd Brigade . 2nd Division , XIV Corps , Army of the Cumberland and Army of Georgia , to June 1865 . The 125th Illinois Infantry mustered out of service on June 9 , 1865 . Detailed service . Moved to Covington , Ky . , September 25 , 1862 . Pursuit of Bragg into Kentucky October 1 – 16 , 1862 . Battle of Perryville , Ky . , October 8 . March to Nashville , Tenn . , October 16 - November 7 , and duty at Nashville until June 30 , 1863 . Moved to Murfreesboro , Tenn . . June 30 . Return to Nashville July 18 and duty there until August 20 . Moved to Chattanooga . Tenn . , via Brentwood , Columbia , Huntsville , Ala . . and Bridgeport , Ala . , August 20 - September 16 . Battle of Chickamauga , September 19 – 21 . Siege of Chattanooga , Tenn . , September 24 - November 23 . Ringgold September 26 . Chattanooga - Ringgold Campaign November 23 – 27 . Orchard Knob November 23 . Tunnel Hill November 24 – 25 . Missionary Ridge November 25 . Pursuit to Graysville November 26 – 27 . March to relief of Knoxville , Tenn . . November 28 - December 17 . At Lee and Gordon ' s Mills until May 1864 . Demonstration on Dalton , Ga . , February 22 – 27 , 1864 . Tunnel Hill , Buzzard ' s Roost Gap and Rocky Faced Ridge February 23 – 25 . Atlanta Campaign May 1 - September 8 . Tunnel Hill May 6 – 7 . Demonstration on Rocky Faced Ridge May 8 – 11 . Buzzard ' s Roost Gap May 8 – 9 . Battle of Resaca May 14 – 15 . Rome May 17 – 18 . Operations on line of Pumpkin Vine Creek and battles about Dallas , New Hope Church and Allatoona Hills May 25 - June 5 . Operations about Marietta and against Kennesaw Mountain June 10 - July 2 . Pine Hill June 11 – 14 . Lost Mountain June 15 – 17 . Assault on Kennesaw June 27 . Ruff ' s Station , Smyrna Camp Ground , July 4 . Chattahoochie River July 5 – 17 . Peach Tree Creek July 19 – 20 . Siege of Atlanta July 22 - August 25 . Utoy Creek August 5 – 7 . Flank movement on Jonesboro August 25 – 30 . Battle of Jonesboro August 31 - September 1 . Lovejoy ' s Station September 2 – 6 . Operations against Hood and Forest in northern Georgia and northern Alabama September 29 - November 3 . March to the sea November 15 - December 10 . Louisville November 30 . Cuyler ' s Plantation December 9 . Siege of Savannah December 10 – 21 . Campaign of the Carolinas January to April 1865 . Averysboro , Taylor ' s Hole Creek , N . C . , March 16 . Battle of Bentonville March 19 – 21 . Occupation of Goldsboro March 24 . Advance on Raleigh April 10 – 14 . Occupation of Raleigh April 14 . Bennett ' s House April 26 . Surrender of Johnston and his army . March to Washington , D . C . , via Richmond , Va . , April 29 - May 19 . Grand Review May 24 . Casualties . The regiment lost a total of 204 men during service ; 9 officers and 88 enlisted men killed or mortally wounded , 3 officers and 104 enlisted men died of disease .