12th Ohio Infantry was an infantry

Infantry

Infantrymen are soldiers who are specifically trained for the role of fighting on foot to engage the enemy face to face and have historically borne the brunt of the casualties of combat in wars. As the oldest branch of combat arms, they are the backbone of armies...

 regiment

Regiment

A regiment is a major tactical military unit, composed of variable numbers of batteries, squadrons or battalions, commanded by a colonel or lieutenant colonel...

 in the Union Army

Union Army

The Union Army was the land force that fought for the Union during the American Civil War. It was also known as the Federal Army, the U.S. Army, the Northern Army and the National Army...

 during the American Civil War

American Civil War

The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

.

History

The 12th OVI was organized at Camp Dennison

Camp Dennison

Camp Dennison was a military recruiting, training, and medical post for the United States Army during the American Civil War. It was located near Cincinnati, Ohio, not far from the Ohio River. The camp was named for Cincinnati native William Dennison, Ohio's governor at the start of the war.With...

, Cincinnati, Ohio

Cincinnati, Ohio

Cincinnati is a city in the U.S. state of Ohio. Cincinnati is the county seat of Hamilton County. Settled in 1788, the city is located to north of the Ohio River at the Ohio-Kentucky border, near Indiana. The population within city limits is 296,943 according to the 2010 census, making it Ohio's...

, on May 3, 1861 for three-months service, and reorganized on June 28 for three years, under Colonel John W. Lowe, who was killed early in the war and was succeeded by Col. Carr B. White

Carr B. White

Carr Baily White was a physician, officer during the Mexican War and general during the American Civil War. His Civil War service is greatly associated with operations in western Virginia and Maryland....

. The 12th Ohio served in western Virginia

West Virginia

West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...

 until August 1862, when it was transferred to the Army of the Potomac

Army of the Potomac

The Army of the Potomac was the major Union Army in the Eastern Theater of the American Civil War.-History:The Army of the Potomac was created in 1861, but was then only the size of a corps . Its nucleus was called the Army of Northeastern Virginia, under Brig. Gen...

 and participated in the battles of Second Bull Run

Second Battle of Bull Run

The Second Battle of Bull Run or Second Manassas was fought August 28–30, 1862, as part of the American Civil War. It was the culmination of an offensive campaign waged by Confederate Gen. Robert E. Lee's Army of Northern Virginia against Union Maj. Gen...

, South Mountain

Battle of South Mountain

The Battle of South Mountain was fought September 14, 1862, as part of the Maryland Campaign of the American Civil War. Three pitched battles were fought for possession of three South Mountain passes: Crampton's, Turner's, and Fox's Gaps. Maj. Gen. George B...

 and Antietam

Battle of Antietam

The Battle of Antietam , fought on September 17, 1862, near Sharpsburg, Maryland, and Antietam Creek, as part of the Maryland Campaign, was the first major battle in the American Civil War to take place on Northern soil. It was the bloodiest single-day battle in American history, with about 23,000...

.

In the fall of 1862, it was again transferred to western Virginia and did efficient service until the spring of 1864, when it joined Hunter's expedition to Lynchburg, Virginia

Lynchburg, Virginia

Lynchburg is an independent city in the Commonwealth of Virginia. The population was 75,568 as of 2010. Located in the foothills of the Blue Ridge Mountains along the banks of the James River, Lynchburg is known as the "City of Seven Hills" or "The Hill City." Lynchburg was the only major city in...

. The regiment returned to Columbus, Ohio

Columbus, Ohio

Columbus is the capital of and the largest city in the U.S. state of Ohio. The broader metropolitan area encompasses several counties and is the third largest in Ohio behind those of Cleveland and Cincinnati. Columbus is the third largest city in the American Midwest, and the fifteenth largest city...

, and was mustered out July 11, 1864.

The 12th OVI sustained a loss in killed, wounded and missing of 455 men.