40th Ohio Infantry

Organized at Camp Chase, Columbus, Ohio, September to November, and mustered in December 7, 1861. Ordered to Eastern Kentucky December 11, 1861. Attached to 18th Brigade, Army of the Ohio, to March, 1862. Unattached, Army of the Ohio to August, 1862. District of Eastern Kentucky, Dept. of the Ohio, to October, 1862. District of the Kanawha, West Virginia, Dept. of the Ohio, to February, 1863. 2nd Brigade, Baird's Division, Army of Kentucky, Dept. of the Cumberland, to June, 1863. 1st Brigade, 1st Division, Renerve Corps, Army of the Cumberland, to October, 1863. 1st Brigade, 2nd Division, 4th Army Corps, Army of the Cumberland, October, 1863. 2nd Brigade, 1st Division, 4th Army Corps, to December, 1864.

SERVICE. – Garfield's Campaign against Humphrey Marshall December 23, 1861, to January 30, 1862. Advance on Paintsville, Ky., December 31, 1861, to January 7, 1862. Occupation of Paintsville January 8 to February 1. Middle Creek, near Prestonburg January 10. Expedition to Pound Gap, Cumberland Mountains, March 14-17. Pound Gap March 16. Moved to Piketon, Ky., and duty there till June 13. Moved to Prestonburg June 13, thence to Louisa July 16, and duty there till September 13. Moved to Gallipolis, Ohio, September 13, thence to Guyandotte, Va., October 4. Moved to Eastern Kentucky November 14, and duty there till February 20, 1863. Ordered to Nashville, Tenn., February 20, thence to Franklin, Tenn. Repulse of Van Dorn's attack on Franklin April 10. Harpeth River, near Franklin, April 10. Duty at Franklin till June 2. Moved to Triune June 2. Middle Tennessee (or Tullahoma) Campaign June 23-July 7. At Wartrace and Tullahoma till September 7. Chickamauga (Ga.) Campaign September 7-22. Reconnoissance from Rossville September 17. Ringgold, Ga., September 17. Battle of Chickamauga September 19-21. Siege of Chattanooga, Tenn., September 24-November 23. Reopening Tennessee River October 26-29. Chattanooga-Ringgold Campaign November 23-27. Lookout Mountain November 23-24. Mission Ridge November 25. Ringgold Gap, Taylor's Ridge, November 27. Duty at Whiteside, Ala., till February, 1864. Demonstration on Dalton, Ga., February 22-27. Tunnel Hill, Buzzard's Roost Gap and Rocky Faced Ridge February 23-25. Atlanta (Ga.) Campaign May 1 to September 8. Tunnel Hill May 6-7. Demonstration on Rocky Faced Ridge and Dalton May 8-13. Buzzard's Roost Gap May 8-9. Battle of Resaca May 14-15. Adairsville May 17. Near Kingston May 18-19. Near Cassville May 19. Advance on Dallas May 22-25. Operations on line of Pumpkin Vine Creek and battles about Dallas, New Hope Church and Allatoona Hills May 25-June 5. Allatoona Pass June 1-2. Operations about Marietta and against Kenesaw Mountain June 10-July 2. Pine Hill June 11-14. Lost Mountain June 15-17. Assault on Kenasaw June 27. Ruff's Station, Smyrna Camp Ground, July 4. Chattahoochie River July 5-17. Peach Tree Creek July 19-20. Siege of Atlanta July 22-August 25. Flank movement on Jonesboro August 25-30. Red Oak Station August 29. Battle of Jonesboro August 31-September 1. Lovejoy Station September 2-6. Companies "A," "B," "C" and "D" mustered out at Pilot Knob, Ga., October 7, 1864. Operations against Hood in North Georgia and North Alabama September 29-November 3. Moved to Pulaski, Tenn., and duty there till November 22. Battle of Franklin November 30. Veterans and Recruits consolidated with 51st Ohio Infantry December 10, 1864.

Regiment lost during service 6 Officers and 96 Enlisted men killed and mortally wounded and 1 Officer and 134 Enlisted men by disease. Total 237.

SOURCE: Frederick H. Dyer, A Compendium of the War of the Rebellion, Part 3, p. 1515