20th Ohio Infantry The 20th Ohio Volunteer Infantry ( or 20th OVI ) was an infantry regiment in the Union Army during the American Civil War . Service . Three - months regiment . The 20th Ohio Infantry was organized at Columbus , Ohio April through May 1861 in response to President Lincoln ' s call for 75 , 000 volunteers and mustered into service on May 23 , 1861 under the command of Colonel Charles Whittlesey . The regiment was ordered to western Virginia and attached to Kelly ' s Command . It participated in action at Richter June 23 and the pursuit of Garnett July 15 – 16 . The regiment then performed duty along Baltimore & Ohio Railroad until August and mustered out on August 23 , 1861 . Three - years regiment . The 20th Ohio Infantry was reorganized at Columbus August 19 through September 21 , 1861 and mustered in for three years service on October 21 , 1861 under the command of Colonel Charles Whittlesey . The regiment was attached to 3rd Brigade , 3rd Division , Army of the Tennessee , February to May 1862 . 2nd Brigade , 3rd Division , Army of the Tennessee , to July 1862 . Unattached , District of Jackson , Tennessee , to November 1862 . 2nd Brigade , 3rd Division , Right Wing , XIII Corps , Department of the Tennessee , to December 1862 . 2nd Brigade , 3rd Division , XVII Corps , Army of the Tennessee and Army of Georgia , to July 1865 . The 20th Ohio Infantry mustered out of service at Louisville , Kentucky on July 18 , 1865 . Detailed service . Moved to Camp King near Covington , Ky . , and mustered in October 21 . Duty at Covington and Newport , Ky . , until February 11 , 1862 . Investment and capture of Fort Donelson , Tenn . , February 14 – 16 , 1862 . Expedition toward Purdy and operations about Crump ' s Landing , Tenn . , March 9 – 14 . Battle of Shiloh , Tenn . , April 6 – 7 . Advance on and siege of Corinth , Miss . , April 29 - May 30 . Guard duty at Pittsburg Landing until June , and at Bolivar , Tenn . , until September . Action at Bolivar August 30 . Duty in the District of Jackson until November . Grant ' s Central Mississippi Campaign November 2 , 1862 to January 10 , 1863 . Action at Holly Springs , Miss . , December 21 , 1862 . Lafayette , Tenn . , January 14 , 1863 . Moved to Memphis , Tenn . , January 26 , thence to Lake Providence , La . , February 22 , and duty there until April . Movement on Bruinsburg and turning Grand Gulf April 25 – 30 . Battle of Port Gibson , Miss . , May 1 . Forty Hills and Hankinson ' s Ferry May 3 – 4 . Battle of Raymond May 12 . Jackson May 14 . Champion Hill May 16 . Siege of Vicksburg May 18 to July 4 . Assaults on Vicksburg May 19 – 22 . Surrender of Vicksburg July 4 . Duty at Vicksburg until February 1864 . Stevenson ' s Expedition to Monroe , La . , August 20 - September 2 , 1863 . Expedition to Canton October 14 – 20 . Bogue Chitto Creek October 17 . Regiment reenlisted January 1 , 1864 . Meridian Campaign February 3 - March 2 . Canton February 26 . Veterans on furlough March and April . Moved to Clifton , Tenn . , then marched to Ackworth , Ga . , April 29 - June 9 . Atlanta Campaign June 9 to September 8 . Operations about Marietta and against Kennesaw Mountain June 10 - July 2 . Assault on Kennesaw June 27 , Nickajack Creek July 2 – 5 . Howell ' s Ferry July 5 . Chattahoochie River July 6 – 17 . Leggett ' s or Bald Hill July 20 – 21 . Battle of Atlanta July 22 . Siege of Atlanta July 22 - August 25 . Flank movement on Jonesboro August 25 – 30 . Sandtown August 28 . Battle of Jonesboro August 31 - September 2 . Lovejoy ' s Station September 2 – 6 . Operations against Hood in northern Georgia and northern Alabama September 29 - November 3 . March to the sea November 15 - December 10 . Siege of Savannah December 10 – 21 . Campaign of the Carolinas January to April 1865 . Pocotaligo , S . C . , January 14 . Barker ' s Mills , Whippy Swamp , February 2 . Salkehatchie Swamp February 3 – 5 . South Edisto River February 9 . North Edisto River February 11 – 13 . Columbia February 16 – 17 . Battle of Bentonville , N . C . , March 20 – 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 20 . Grand Review May 24 . Moved to Louisville , Ky . , June . Casualties . The regiment lost a total of 360 men during service ; 2 officers and 87 enlisted men killed or mortally wounded , 4 officers and 267 enlisted men died of disease .