Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The 27th Ohio Infantry was organized at in July 15 through August 18, 1861 and mustered in for three years service under the command of . The regiment was attached to Army of the West and , to February 1862. 1st Brigade, 1st Division, , to April 1862. 1st Brigade, 2nd Division, Army of the Mississippi, to November 1862. 1st Brigade, 8th Division, Left Wing, , , to December 1862. 1st Brigade, 8th Division, , to March 1863. 4th Brigade, District of Corinth, Mississippi, 2nd Division, XVI Corps, to May 1863. 3rd Brigade, District of Memphis, Tennessee, 5th Division, XVI Corps, to November 1863. Fuller's 4th Brigade, 2nd Division, XVI Corps, to March 1864. 1st Brigade, 4th Division, XVI Corps, to September 1864. 1st Brigade, 1st Division, , to July 1865.