2nd Regiment, Missouri State Militia Cavalry (Union)
This regiment was organized in Missouri at large December, 1861, to April, 1862, and by consolidation of original 2nd and 11th Regiments, State Militia Cavalry. Attached to District of Northern Missouri, Dept. of Missouri, to March, 1863. District of St. Louis, Mo., Dept. of Missouri, to June, 1863. District of Southeast Missouri, Dept. of Missouri, to July, 1863. District of St. Louis, Mo., Dept. of Missouri, to April, 1865. 
Another source gives the following. The 2nd Regiment, Missouri State Militia Cavalry was enrolled between 4 December 1861 and 19 March 1862. They were mustered between 4 December 1861 and 1 November 1862. The Regiment was discharged between 28 February 1865 and 17 April 1865. This Regiment was led by Colonel Hiram M. Hiller, Colonel John McNeil, and Colonel J. B. Rogers. 
For more information on the history of this unit, see:
- The Civil War Archive section, 2nd Regiment State Militia Cavalry, (accessed 13 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 William Dawson - Many men from Kahoka, Clark County.
Company B - Captain James W. Edwards - Many men from Kahoka, Clark County.
Company C - Captain Perry D McClenihan - Many men from Putnam County.
Company D - Captain Ignatius Burns - Mayn men from Alexandria, Clark County.
Company E - Captain Henry C. Gentry - Many men from Hannibal, Marion County.
Company F - Captain Fred R. Vincent - Many men from Alexandria, Clark County.
Company G - Major Josephus Robbins - Many men from Hannibal, Marion County.
Company H - Captain Richard M. Hulse - Many men from Macon County.
Company I - Captain Albert G. Priest - Many men from Shelbyville, Shelby County.
Company K - Captain Lewis Sells - Many men from Newark, Knox County.
Company L - Captain Amos Wright - Many men from Macon County.
Company M - Captain Samuel Shibley - Many men from Macon County.
The above information about the companies with partial rosters is found in Kenneth E. Weant's book, Civil War Records: Union Troops Missouri State Militia Cavalry, Volume 6.
- 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 6 December 2010).
- Kenneth E. Weant, Civil War Records Union Troops Enrolled Missouri Militia, Volume 6 (Arlington, Texas : K.E. Weant, c2007), pages #35-57. FHL book 977.8 M2wkc v. 6