66th Ohio Infantry The 66th Ohio Volunteer Infantry ( or 66th OVI ) was an infantry regiment in the Union Army during the American Civil War . Service . The 66th Ohio Infantry was organized at Camp McArthur in Urbana , Ohio and mustered in for three years service on December 17 , 1861 under the command of Colonel Charles Candy . The regiment was attached to 3rd Brigade , Landers ' Division , Army of the Potomac , to March 1862 . 2nd Brigade , Shields ' 2nd Division , Banks ' V Corps and Department of the Shenandoah , to May 1862 . 2nd Brigade , Shields ' Division , Department of the Rappahannock , to June 1862 . 2nd Brigade , 1st Division , II Corps , Army of Virginia , to August 1862 . 1st Brigade , 2nd Division , II Corps , Army of Virginia , to September 1862 . 1st Brigade , 2nd Division , XII Corps , Army of the Potomac , to October 1863 , and Army of the Cumberland to April 1864 . 1st Brigade , 2nd Division , XX Corps , Army of the Cumberland , to July 1865 . The 66th Ohio Infantry mustered out of service at Louisville , Kentucky on July 15 , 1865 . Detailed service . Ordered to New Creek , Va . , January 17 , 1862 . Advance toward Winchester , Va . , March 7 – 15 , 1862 . Provost duty at Martinsburg , Winchester , and Strasburg until May . March to Fredericksburg , Va . , May 12 – 21 , and to Port Republic May 25 - June 7 . Battle of Port Republic June 9 . Ordered to Alexandria and duty there until August . Operations near Cedar Mountain August 10 – 18 . Pope ' s Campaign in northern Virginia August 18 - September 2 . Guarding trains of the army during the battles of Bull Run August 28 – 30 . Maryland Campaign September 6 – 22 . Battle of Antietam September 16 – 17 . Duty at Bolivar Heights until December . Reconnaissance to Rippon , Va . , November 9 . Reconnaissance to Winchester December 2 – 6 . Berryville December 1 . Dumfries December 27 . " Mud March " January 20 – 24 , 1863 . At Stafford Court House until April 27 . Chancellorsville Campaign April 27 - May 6 . Battle of Chancellorsville May 1 – 5 . Gettysburg Campaign June 11 - July 24 . Battle of Gettysburg July 1 – 3 . Pursuit of Lee to Manassas Gap , Va . , July 5 – 24 . Duty at New York during draft disturbances August 15 - September 8 . Movement to Bridgeport , Ala . , September 24 - October 3 . Skirmish at Garrison ' s Creek near Fosterville October 6 ( detachment ) . 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 . Regiment reenlisted December 15 , 1863 . Duty at Bridgeport and in Alabama until May 1864 . Scout to Caperton ' s Ferry March 29 - April 2 . Expedition from Bridgeport down Tennessee River to Triana April 12 – 16 . Atlanta Campaign May 1 - September 8 . Demonstrations on Rocky Faced Ridge May 8 – 11 . Dug Gap or Mill Creek May 8 . Battle of Resaca May 14 – 15 . Cassville May 19 . New Hope Church May 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 . Gilgal or Golgotha Church June 15 . Muddy Creek June 17 . Noyes Creek June 19 . Kolb ' s Farm June 22 . Assault on Kennesaw June 27 . Ruff ' s Station July 4 . Chattahoochie River July 5 – 17 . Peachtree Creek July 19 – 20 . Siege of Atlanta July 22 - August 25 . Operations at Chattahoochie River Bridge August 26 - September 2 . Occupation of Atlanta September 2 - November 15 . Near Atlanta November 9 . March to the sea November 15 - December 10 . Siege of Savannah December 10 – 21 . Campaign of the Carolinas January to April 1865 . Little Cohora Creek , N . C . , March 16 . Battle of Bentonville March 19 – 21 . Occupation of Goldsboro March 24 . Advance on Raleigh April 10 – 14 . Occupation of Raleigh April 14 . Bennett ' s House April 26 . Surrender of Johnston and his army . March to Washington , D . C . , via Richmond , Va . , April 29 - May 20 . Grand Review of the Armies May 24 . Moved to Louisville , Ky . , June . Casualties . The regiment lost a total of 245 men during service ; 5 officers and 96 enlisted men killed or mortally wounded , 1 officer and 143 enlisted men died of disease .