1st Regiment, Ohio Infantry (3 months, 1861)

United States     U.S. Military      Ohio      Ohio Military      Ohio in the Civil War      Ohio Civil War Union Units 1st through 8th      1st Regiment, Ohio Infantry (3 months, 1861)

Brief History
The 1st Regiment was organized at large from April 14 to April 29, 1861 and was mustered in April 17, 1861 for 3 months of service. It mustered out August 2, 1861 in Ohio.

After it mustered out, a number of the men re-enlisted in the reconstituted 1st Regiment for 3 years.

The Wikipedia article, 1st Ohio Infantry, gives brief histories of both the 3 month regiment and the 3 year regiment.

Companies in this Regiment with the Counties of Origin
Men often enlisted in a company recruited in the counties where they lived though not always. After many battles, companies might be combined because so many men were killed or wounded. However if you are unsure which company your ancestor was in, try the company recruited in his county first.