The 1st Ohio Volunteer Infantry Regiment was organized in April of 1861 for three months service. It was sent to Washington D.C. to join the troops defending the capital. After participating in the Battle of Bull Run it returned to Ohio to muster out. It would be reconstituted for service in the Western Theater.
|April 14 –
|Organized at large in the State of Ohio|
The regiment mustered in for three months service under the command of Colonel Alexander M. McCook.
|April 19||Moved to Washington, D.C. for duty in the defenses of that city. Attached to the Department of Washington.|
|June||Attached to Schenck’s Brigade, Tyler’s Division, McDowell’s Army of Northeast Virginia.|
|June 17 & July 9||Actions at Vienna, Virginia.|
|July 16-21||Took part in McDowell’s advance on Manassas, Virginia.|
|July 17||Occupation of Fairfax Court House, Virginia.|
In Reserve during the battle. Covered the retreat to Washington, losing no casualties.
|August 2||Ordered to Ohio and mustered out on the expiration of its term of enlistment.|
|Fall||The 1st Ohio Infantry Regiment was reorganized for three years service in the fall of 1861. It would serve the rest of the Civil War in the Western Theater.|