Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The 120th Ohio Volunteer Infantry (or 120th OVI) was an infantry regiment in the Union Army during the American Civil War. The 120th Ohio Infantry was organized Mansfield, Ohio and mustered in August 29, 1862 for three years service under the command of Colonel Daniel French. The regiment first served unattached, Army of Kentucky, Department of the Ohio, to November 1862. 1st Brigade, 9th Division, Right Wing, XIII Corps, Department of the Tennessee, to December 1862. 1st Brigade, 3rd Division, Sherman's Yazoo Expedition, to January 1863. 1st Brigade, 9th Division, XIII Corps, Army of the Tennessee, to July 1863. 3rd Brigade, 1st Division, XIII Corps, Department of the Tennessee, to August 1863, and Department of the Gulf to November 1863. Plaquemine, Louisiana, District of Baton Rouge, Louisiana, Department of the Gulf, to March 1864. 2nd Brigade, 1st Division, XIII Corps, to June 1864.