12th Regiment, Illinois Infantry (3 months, 1861)

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United States   Gotoarrow.png   U.S. Military   Gotoarrow.png   Illinois   Gotoarrow.png   Illinois Military   Gotoarrow.png   Illinois in the Civil War   Gotoarrow.png   12th Regiment, Illinois Infantry (3 months, 1861)

Brief History

The 12th Regiment, Illinois Infantry (3 months, 1861) was organized at Springfield, Illinois and mustered in May 2, 1861.  It mustered out August 1, 1861 probably Cairo, Illinois.[1].

Companies in this Regiment with County 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.

The following counties of origin are taken from the Adjutant General's Report, found on the Illinois Civil War Rosters web site. Roster pages are from the same report found on the Internet Archives web site. The rosters show the men who served in each regiment, their residences, dates of enlistment and mustering out, and other remarks.

Company A - many men from Cook County - Cook County web site -

Company B - many men from LaSalle County - La Salle County web site -

Company C - many men from Vermilion County - Vermilion County web site -

Company D - many men from Rock Island County - Rock Island County web site -

Company E - many men from Edgar County - Edgar County web site

Company F - many men from Jo Daviess County - Jo Daviesee County web site -

Company G - many men from Perry County - Perry County web site -

Company H - many men from Bureau County - Bureau County web site -

Company I - many men from Bureau County - Bureau County web site -

Company K - many men from Cook and Sangamon counties - Cook and Sangamon county web sites - 

Other Sources




  1. National Park Service, The Civil War Soldiers and Sailors System (accessed 4 January 2011).