40th Ohio Infantry The 40th Ohio Volunteer Infantry ( or 40th OVI ) was an infantry regiment in the Union Army during the American Civil War . Service . The 40th Ohio Infantry was organized at Camp Chase in Columbus , Ohio September through November 1861 and mustered in for three years service on December 7 , 1861 under the command of Colonel Jonathan Cranor . The regiment was attached to 18th Brigade , Army of the Ohio , to March 1862 . Unattached , Army of the Ohio to August 1862 . District of Eastern Kentucky , Department of the Ohio , to October 1862 . District of the Kanawha , West Virginia , Department of the Ohio , to February 1863 . 2nd Brigade , Baird ' s Division , Army of Kentucky , Department of the Cumberland , to June 1863 . 1st Brigade , 1st Division , Reserve Corps , Army of the Cumberland , to October 1863 . 1st Brigade , 2nd Division , IV Corps , Army of the Cumberland , October 1863 . 2nd Brigade , 1st Division , IV Corps , to December 1864 . Companies A , B , C , and D mustered out of service at Pilot Knob , Georgia on October 7 , 1864 . The remainder of the regiment mustered out at Nashville , Tennessee on December 10 , 1864 , with veterans and recruits being transferred to the 51st Ohio Infantry . Detailed service . Ordered to eastern Kentucky December 11 , 1861 . 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 , then to Louisa July 16 , and duty there until September 13 . Moved to Gallipolis , Ohio , September 13 , then 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 . Tullahoma Campaign June 23 - July 7 . At Wartrace and Tullahoma until September 7 . Chickamauga Campaign September 7 – 22 . Reconnaissance 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 . Missionary 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 . Atlanta 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 Kennesaw 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 . Peachtree 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 ' s Station September 2 – 6 . Operations against Hood in northern Georgia and northern Alabama September 29 - November 3 . Moved to Pulaski , Tenn . , and duty there until November 22 . Battle of Franklin November 30 . Casualties . The regiment lost a total of 237 men during service ; 6 officers and 96 enlisted men killed or mortally wounded , 1 officer and 134 enlisted men died of disease .