15th Indiana Infantry Regiment The 15th Regiment Indiana Infantry was an infantry regiment that served in the Union Army during the American Civil War . Service . The 15th Indiana Infantry was organized at Lafayette , Indiana for a one - year enlistment in May 1861 . It was subsequently reorganized and mustered in for a three - year enlistment on June 14 , 1861 under the command of Colonel George Day Wagner . The regiment was attached to 1st Brigade , Army of Occupation , Western Virginia , July to September 1861 . Reynolds ' Cheat Mountain District , Western Virginia , to November 1861 . 15th Brigade , Army of the Ohio , to December 1861 . 15th Brigade , 4th Division , Army of the Ohio , to March 1862 . 15th Brigade , 6th Division , Army of the Ohio , March 1862 . 21st Brigade , 6th Division , Army of the Ohio , to September 1862 . 21st Brigade , 6th Division , II Corps , Army of the Ohio , to November 1862 , 2nd Brigade , 1st Division , Left Wing , XIV Corps , Army of the Cumberland , to January 1863 . 2nd Brigade , 1st Division , XXI Corps , Army of the Cumberland , to October 1863 . 2nd Brigade , 2nd Division , IV Corps , Army of the Cumberland , to February 1864 . Garrison , Chattanooga , Tennessee , Department of the Cumberland , to June 1864 . The 15th Indiana Infantry mustered out of service at Chattanooga , Tennessee on June 16 , 1864 . Veterans and recruits were transferred to the 17th Indiana Infantry . Detailed service . Moved to Indianapolis , Ind . , thence to Clarksburg , Va . , July 1 – 6 . Western Virginia Campaign July 6 – 17 . Duty in Elkwater Valley , Va . , July to November 1861 . Operations on Cheat Mountain September 11 – 17 . Elkwater September 11 . Cheat Mountain Pass September 12 . Greenbrier River October 3 – 4 . Ordered to Louisville November 19 . Duty at Bardstown and Lebanon , Ky . , until February 1862 . March to Nashville , Tenn . , February 17 - March 13 , and to Savannah , Tenn . , March 21 - April 6 . Battle of Shiloh April 6 – 7 . Advance on and siege of Corinth , Miss . , April 29 - May 30 . Pursuit to Booneville May 30 - June 12 . Buell ' s Campaign in northern Alabama and middle Tennessee June to August . March to Louisville , Ky . , in pursuit of Bragg August 21 - September 26 . Pursuit of Bragg into Kentucky October 1 – 22 . Battle of Perryville , Ky . , October 8 ( reserve ) . March to Nashville , Tenn . , October 22 - November 7 , and duty there until December 26 . Lavergne December 11 . Advance on Murfreesboro December 26 – 30 . Battle of Stones River December 30 – 31 , 1862 and January 1 – 3 , 1863 . Duty at Murfreesboro until June . Reconnaissance to Nolensville and Versailles January 13 – 15 . Tullahoma Campaign June 23 - July 7 . Camp at Pelham until August 17 . Passage of the Cumberland Mountains and Tennessee River and Chickamauga Campaign August 17 - September 22 . Occupation of Chattanooga September 9 , and assigned to duty there as garrison . Siege of Chattanooga , September 24 - November 23 . Chattanooga - Ringgold Campaign November 23 – 27 . Orchard Knob November 23 – 24 . Missionary Ridge November 25 . Pursuit to Graysville November 26 – 27 . March to relief of Knoxville , November 28 - December 8 . Duty at Knoxville and vicinity until February 1864 . Ordered to Chattanooga , and garrison duty there until June . Casualties . The regiment lost a total of 183 men during service ; 4 officers and 103 enlisted men killed or mortally wounded , 76 enlisted men died of disease .