80th Indiana Infantry Regiment  The 80th Regiment Indiana Infantry was an infantry regiment that served in the Union Army during the American Civil War. The 80th Indiana Infantry was organized at Princeton and Indianapolis, Indiana and mustered in for a three-year enlistment on September 8, 1862, under the command of Lieutenant Colonel Lewis Brooks. The regiment was attached to 34th Brigade, 10th Division, Army of the Ohio, September 1862. 34th Brigade, 10th Division, I Corps, Army of the Ohio, to November 1862. District of Western Kentucky, Department of the Ohio, to June 1863. 2nd Brigade, 3rd Division, XXIII Corps, Department of the Ohio, to August 1863. 1st Brigade, 2nd Division, XXIII Corps, Army of the Ohio, to June 1864. 2nd Brigade, 2nd Division, XXIII Corps, Army of the Ohio, to February 1865, and Department of North Carolina to June 1865. The 80th Indiana Infantry mustered out of service on June 22, 1865. Recruits were transferred to the 122nd Indiana Infantry. Left Indiana for Covington, Kentucky, September 9, then moved to Louisville, Kentucky. Pursuit of Bragg into Kentucky October 1–15. 1862. Battle of Perryville, October 8. Moved to Lebanon, Kentucky, and duty there until December. Pursuit of Morgan to the Cumberland River December 22, 1862, to January 2, 1863. Duty at Elizabethtown, Kentucky, until March, and at Woodsonville until August. Pursuit of Morgan June 20-July 5. Burnside's Campaign in eastern Tennessee August 16-October 17. March over Cumberland Mountains to Knoxville August 16-September 3. Duty at Kingston until December 5. Action at Kingston November 24. Moved to Nashville, Tennessee, December 6, thence march to Blain's Cross Roads and Mossy Creek. Mossy Creek, Talbot Station, December 29. Operations in eastern Tennessee until April 1864. Atlanta Campaign May 1 to September 8. Demonstrations on Rocky Faced Ridge and Dalton, Georgia, May 9–13. Battle of Resaca, May 14–15. Advance on Dallas May 18–25. 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.