15th Regiment, Missouri Infantry (Union)
This regiment was organized at St. Louis, Mo., August and September, 1861. It moved to Jefferson City, Mo., September, 1861. Then it was attached to Fremont's Army of the West to January, 1862. 5th Brigade, Army of Southwest Missouri, to March, 1862. 1st Brigade, 2nd Division, Army of Southwest Missouri, to May, 1862. 1st Brigade, 5th Division, Army of Mississippi, to September, 1862. 35th Brigade, 11th Division, Army of Ohio, to October, 1862. 35th Brigade, 11th Division, 3rd Army Corps, Army of Ohio, to November, 1862. 2nd Brigade, 3rd Division, Right Wing 14th Army Corps, Army of the Cumberland, to January, 1863. 2nd Brigade, 3rd Division, 20th Army Corps, Army of the Cumberland, to October, 1863. 1st Brigade, 2nd Division, 4th Army Corps, to April, 1864. 3rd Brigade, 2nd Division, 4th Army Corps, to June, 1865. 2nd Brigade, 2nd Division, 4th Army Corps, to August, 1865. Dept. of Texas to December, 1865. 
For more information on the history of this unit, see:
- The Civil War Archive section, 15th Regiment Infantry, (accessed 25 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.
Company A - Captain Edward Borde (De Borde), Captain Joseph Elmer, Captain Max Goeden, and Captain Frank Unger - St Louis, Missouri
Company B - Captain William Wisermann, Captain George Ernist, Captain Casimer Murri (Muri), Captian Henry, Nelson and Capt John Weber - St. Louis, Missouri.
Company C - Captain Jacob Gross, Captain John G. Reis, Joseph B. Yourdon and Captain Melchoir Zimmerman - St. Louis, Missouri.
Company D - Captain Louis Bergan, Captain John Pestel and Captain Jacob, Straub - St Louis, Missouri.
Company E - Captain John Berend, Captain George, Isenstein and Captain John Wilborger -St. Louis, Missouri.
Company F - Captain Joseph Droste, Captain Ftancis Mohrhardt and Captain Samuel Rexinger - St. Louis, Missouri.
Company G - Captain George Berg and Captain George Muller (Miller) - St Louis, Missouri.
Company H - Captain John Bringarter, Captain John V. Krebs, Captain Fred Meier and Captain Alfred Weidmer - St. Louis, Missouri.
Company I - Captain Edward Richter and Captain Adolph Schuster - Edwardswille, Madison, Missouri.
Company K - Captain John Jeckin, Captain Nicholas D. Randell and Captain Ulerich Schwendener - St. Louis, Missouri.
The information about the companies and counties is from Kenneth E. Weant's book, Civil War Records, Missouri Volunteer Infantry, Volume 3, Three Year Volunteer Regiments 11-18, 25, (Arlington, Texas: K.E. Weant, c2011), pages 106-124. FHL 977.8 M2wkv v. 2
- 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.
- Allendorf, Donald. Long road to liberty : the odyssey of a German regiment in the Yankee army, the 15th Missouri volunteer army. (Kent, Ohio : Kent State University Press, c2006), FHL book 977.8 M2ad
- Marcoot, Maurice. Five years in the sunny South : reminiscences of Maurice Marcoot. (Bethesda, Maryland : University Publications of America, c1990), FHL fiche 6082535
- National Park Service, The Civil War Soldiers and Sailors System, (accessed 21 Sept 2011).