The 12th Ohio Independent Battery lost 3 enlisted men killed or mortally wounded 17 enlisted men to disease during the Civil War.

1861
July 27 Entered service as Company G, 25th Ohio Volunteer Infantry
1862
March 17 Company permanently detached from 25th Ohio Infantry as 12th Ohio Battery. Attached to Milroy’s Independent Brigade, Dept. of the Mountains
April 1-12 Expedition on the Seneca
April At Staunton
May 8
Battle of McDowell
May 10-12 Franklin
June Attached to Milroy’s Independent Brigade, 1st Corps, Army of Virginia
June 8
Battle of Cross Keys
August 16-September 2 Pope’s Campaign in Northern Virginia
August 21-23 Fords of the Rappahannock
August 22 Freeman’s Ford and Hazel Run
August 29 Battle of Groveton
August 30
Second Battle of Bull Run
September Duty in the Defenses of Washington, D.C. attached to Artillery, 2nd Division, 11th Army Corps, Army of the Potomac
December 12-16 Moved to Fredericksburg, Va.
1863
January 20-24 “Mud March”
January Attached to Provost Guard, Army of the Potomac
April 27-May 6 Chancellorsville Campaign, attached to Artillery Reserve, Army of the Potomac
May Duty in the Defenses of Washington, D.C. attached to Camp Barry, Defenses of Washington, D.C., 22nd Army Corps
September 25-October 6 Moved to Bridgeport, Ala.
September Garrison duty at Nashville, Tenn. attached to Artillery Brigade, 11th Army Corps, Army of the Cumberland
December Attached to 2nd Division, Artillery Reserve, Dept. of the Cumberland
1864
April At Murfreesboro, Tenn., attached to Garrison Artillery, Murfreesboro, Tenn., Dept. of the Cumberland
July Attached to 1st Brigade, Defenses Nashville & Chattanooga Railroad, Dept. of the Cumberland
December 5-12 Defense of Murfreesboro
December 7 Wilkinson’s Pike
1865
July 12 Mustered out