1st Regiment, Missouri Infantry (3 months 1861) (Union)
This regiment was organized at St. Louis, Missouri, for three months April 22, 1861. It was attached to 3rd Brigade, Lyon's Army of the West. 
For more information on the history of this unit, see:
- The Civil War Archive section, 1st Regiment Infantry (3 months), (accessed 21 July 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.
Unassigned Men Detachment - mustered at St. Louis, Missouri - Captain Alfred Tracy
Company A - Captains William Fuchs, William L. Lathrop, Francis H. Manter
Company B - Captain Thomas D. Maurice
Company C - Captain George A. Stone
Company D - Captains Charles W. Anderson, Henry Richardson
Company E - Captain Nelson Cole
Company F - Captains Walter C. Gantt (Gautt), Cary Gratz
Company G - Captain John S. Cavender
Company H - Captain Theodore Yates
Company I - Captain Madison Miller
Company K - Captain Patrick Burke
The information about the counties is from Kenneth E. Weant's book, Civil War Records, Missouri Volunteer Infantry, Volume 1, Three Month Volunteer Regiments, 1-5 and Three Year Volunteer Regiments 1-3, (Arlington, Texas: K.E. Waant, c2011), pages . FHL book 977.8 M2wkv. Partial rosters are also included.
- Beginning United States Civil War Research gives steps for finding information about a Civil War soldier or sailor. It covers the major records that should be used. Additional records are described in 'Missouri 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.
- Missouri in the Civil War describes many Confederate and Union sources, specifically for Missouri, 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 11 January 2011).