18th Regiment, Ohio Infantry (3 months, 1861)
The 18th Regiment, Ohio Infantry (3 months, 1861) mustered in as follows: Companies "A," "C" and "E" enrolled at Ironton, Ohio, April 22, 1861; Company "B" at Marietta April 27; Company "D" at McArthur April 18; Company "F" at Gallipolis April 22, 1861; Company "I" at Jackson April 24, 1861; Company "K" at Beverly April 23, 1861. The regiment was organized at Parkersburg and organization perfected May 29, 1861. They were mustered out August 28, 1861 at Columbus, Ohio. 
For more information on the history of this unit, see:
- Larry Stevens' Ohio in the Civil War, 18th Ohio Infantry
- The Civil War Archive section, 18th Regiment Infantry (3 months), (accessed 29 August 2012).
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.
Company A - Many men from Ironton, Lawrence County
Company C - Many men from Ironton, Lawrence County
Company D - Many men from McArthur, Vinton County
Company E - Many men from Ironton, Lawrence County
Company F - Many men from Gallipolis, Gallia County
Company G -
Company H -
Company I - Many men from Jackson, Jackson County
Company K - Many men from Beverly, Washington County
- Beginning United States Civil War Research gives steps for finding information about a Civil War soldier. It covers the major records that should be used. Additional records are described in ‘Ohio in the Civil War’ and ‘United States Civil War, 1861 to 1865’ (see below).
- National Park Service, The Civil War Soldiers and Sailors System, is searchable by soldier's name and state. It contains basic facts about soldiers on both sides of the Civil War, a list of regiments, descriptions of significant battles, sources of the information, and suggestions for where to find additional information.
- Ohio in the Civil War describes many Confederate and Union sources, specifically for Ohio, and how to find them.. These include compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.
- United States Civil War, 1861 to 1865 describes and explains United States and Confederate States records, rather than state records, and how to find them. These include veterans’ censuses, compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.
- National Park Service, The Civil War Soldiers and Sailors System, (accessed 6 December 2010).
- Jewett Palmer, Historical Sketch of Company 'B', Eighteenth Regiment Ohio Volunteer Infantry, Three Months Service, (s.l.: s.n., 1911?), p. 3.