40th Ohio Infantry

== Regimental History and Service Record ==
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, Reserve 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 until June 13. Moved to Prestonburg June 13, thence to Louisa July 16, and duty there until September 13. Moved to Gallipolis, Ohio, September 13, thence to Guyandotte, Va., October 4. Moved to Eastern Kentucky November 14, and duty there until 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 until June 2. Moved to Triune June 2. Middle Tennessee (or Tullahoma) Campaign June 23-July 7. At Wartrace and Tullahoma until September 7. 
* August 16-September 22, 1863 - The Chickamauga Campaign
** Reconnaissance from Rossville September 17. 
** Ringgold, Ga., September 17. 
** September 19-September 20, 1863 - Battle of Chickamauga, Georgia
* September 24-October 27, 1863 - Siege of Chattanooga, Tennessee
* Reopening Tennessee River October 26-29. 
* November 23-27, 1863 - The Chattanooga/Ringgold Campaign
** Lookout Mountain November 23-24. 
** Mission Ridge November 25. 
** Ringgold Gap, Taylor's Ridge, November 27. 
Duty at Whiteside, Ala., until February, 1864. Demonstration on Dalton, Ga., February 22-27. Tunnel Hill, Buzzard's Roost Gap and Rocky Faced Ridge February 23-25. 
* May 1-September 8, 1864 - The Atlanta Campaign
** Tunnel Hill May 6-7. 
** May 9-13, 1864 - Demonstration on Dalton, Georgia
** May 8-11, 1864 - Demonstration against Rocky Faced Ridge, Georgia
** Buzzard's Roost Gap May 8-9. 
** May 14-May 15, 1864 - Battle of Resaca, Georgia
** Adairsville May 17. 
** Near Kingston May 18-19. 
** Near Cassville May 19. 
** Advance on Dallas May 22-25. 
** May 25-June 5, 1864 - Operations in Bartow County, Georgia
*** June 1-June 2, 1864 - Engagement at Allatoona Pass, Georgia
** Operations about Marietta and against Kenesaw Mountain June 10-July 2. 
** Pine Hill June 11-14. 
** Lost Mountain June 15-17. 
** Assault on Kennesaw June 27. 
** Ruff's Station, Smyrna Camp Ground, July 4. 
** Chattahoochie River July 5-17. 
** Peach Tree Creek July 19-20. 
** July 22-August 25, 1864 - Siege of Atlanta, Georgia
** 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 until November 22. 
* Battle of Franklin November 30. 
* Veterans and Recruits consolidated with 51st Ohio Infantry December 10, 1864.
== Regimental Roster ==
== Regiment Statistical Information ==
* 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.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 701, 703, 704, 705, 707, 715, 735, 860, 862, 866, 1515)
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