The 23rd Regiment, Ohio Volunteer Infantry (or 23rd OVI) 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 much of 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...

. It served in the Eastern Theater

Eastern Theater of the American Civil War

The Eastern Theater of the American Civil War included the states of Virginia, West Virginia, Maryland, and Pennsylvania, the District of Columbia, and the coastal fortifications and seaports of North Carolina...

 in a variety of campaigns and battles, and is remembered with a stone memorial on the Antietam National Battlefield

Antietam National Battlefield

Antietam National Battlefield is a National Park Service protected area along Antietam Creek in Sharpsburg, Maryland which commemorates the American Civil War Battle of Antietam that occurred on September 17, 1862...

 not far from Burnside's Bridge

Burnside's Bridge

Burnside's Bridge is a landmark on the Antietam National Battlefield near Sharpsburg, Maryland. Crossing over Antietam Creek, the bridge played a key role in the September 1862 Battle of Antietam during the American Civil War when a small number of Confederate soldiers from Georgia for several...

.

The regiment later became noted for its many postbellum politicians. Future Presidents

President of the United States

The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....

 Rutherford B. Hayes

Rutherford B. Hayes

Rutherford Birchard Hayes was the 19th President of the United States . As president, he oversaw the end of Reconstruction and the United States' entry into the Second Industrial Revolution...

 and William McKinley

William McKinley

William McKinley, Jr. was the 25th President of the United States . He is best known for winning fiercely fought elections, while supporting the gold standard and high tariffs; he succeeded in forging a Republican coalition that for the most part dominated national politics until the 1930s...

 served in this unit, as did future U.S.