66th Ohio Infantry

== Regimental History and Service Record ==
Organized at Camp McArthur, Urbana, Ohio, and mustered in December 17, 1861. Ordered to New Creek, W. Va., January 17, 1862. Attached to 3rd Brigade, Landers' Division, Army of the Potomac, to March, 1862. 2nd Brigade, Shields' 2nd Division, Banks' 5th Army Corps and Dept. of the Shenandoah, to May, 1862. 2nd Brigade, Shields' Division, Dept. of the Rappahannock, to June, 1862. 2nd Brigade, 1st Division, 2nd Corps, Army of Virginia, to August, 1862. 1st Brigade, 2nd Division, 2nd Corps, Army of Virginia, to September, 1862. 1st Brigade, 2nd Division, 12th Army Corps, Army of the Potomac, to October, 1863, and Army of the Cumberland to April, 1864. 1st Brigade, 2nd Division, 20th Army Corps, Army of the Cumberland, to July, 1865.
SERVICE.--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. 
* September 3-20, 1862 - The Maryland Campaign
** September 17, 1862 - Battle of Antietam, Maryland
Duty at Bolivar Heights until December. Reconnaissance to Rippon, W. Va., November 9. Reconnaissance to Winchester December 2-6. 
* December 1, 1862 - Skirmish at Berryville, Virginia 
Dumfries December 27. "Mud March" January 20-24, 1863. At Stafford Court House until April 27. 
* April 27-May 6, 1863 - The Chancellorsville Campaign
** May 1-5, 1863 - Battle of Chancellorsville, Virginia
* June 11-August 1, 1863 - The Gettysburg Campaign
** July 1-3, 1863 - Battle of Gettysburg, Pennsylvania
** 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. 
* November 23-27, 1863 - The Chattanooga/Ringgold Campaign
** Lookout Mountain November 23-24.
** Mission 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. 
* April 12-16, 1864 - Reconnaissance from Bridgeport, Alabama to Triana, Alabama (detachment)
* May 1-September 8, 1864 - The Atlanta Campaign
** May 8-11, 1864 - Demonstration against Rocky Faced Ridge, Georgia
** Dug Gap or Mill Creek May 8. 
** May 14-May 15, 1864 - Battle of Resaca, Georgia
** Cassville May 19. 
** New Hope Church May 25. 
** May 25-June 5, 1864 - Operations in Bartow County, Georgia
** Operations about Marietta and against Kenesaw 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 Kenesaw June 27. 
** Ruff's Station July 4. 
** Chattahoochie River July 5-17. 
** Peach Tree Creek July 19-20. 
** July 22-August 25, 1864 - Siege of Atlanta, Georgia
** Operations at Chattahoochie River Bridge August 26-September 2. 
** September 2-November 15 - Occupation of Atlanta, Georgia
** November 9, 1864 - Skirmish near Atlanta, Georgia 
* November 15-December 21, 1864 - The Savannah Campaign
** December 10-21, 1864 - Siege of Savannah, Georgia
* January 1-April 26, 1865 - The Carolinas Campaign
** 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 May 24. 
* Moved to Louisville, Ky., June, and there mustered out July 15, 1865.
== Regimental Roster ==
== Regiment Statistical Information ==
* Regiment lost during service 5 Officers and 96 Enlisted men killed and mortally wounded and 1 Officer and 143 Enlisted men by disease. Total 245.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 665, 703, 704, 705, 707, 715, 719, 721, 723, 761, 827, 834, 866, 905, 911, 916, 1527-1528)
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