12th Regiment, Mississippi Infantry
12th Infantry Regiment was assembled at Corinth, Mississippi, in May, 1861. The men were from the counties of Hinds, Adams, Lawrence, Copiah, Warren, Panola, Claiborne, Yazoo, Jefferson, Holmes, and Calhoun. The field officers were Colonels Richard Griffith, Merry B. Harris, Henry Hughes, and William H. Taylor; Lieutenant Colonel Samuel B. Thomas; and Majors James R. Bell, John R. Dickins, and W.H. Lilly. 
- The 12th Regiment, Mississippi Infantry Internet site has a longer history taken from Dunbar Rowland's Military History of Mississippi, 1803-1898.
Regiment Companies with the 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 (Mississippi) MSGenWeb page for Lawrence County, Mississippi has a Regiment Roster List arranged alphabetically.
Company B - (Natchez Fencibles) - raised in Adams County
Company C - (Raymond Fencibles; also listed as Co. A) - raised in Hinds County
Company D - (Pettus Relief, aka Pettus Rifles) - raised in Copiah County
Company E - (Sardis Blues; also listed as Co. F) - raised in Panola County
Company F - (Durant Rifles; also listed as Co. I) - raised in Holmes County
Company H - (Claiborne Guards; also listed as Co. K) - raised in Claiborne County
Company I - (Satartia Rifles; also listed as Co. G) - raised in Yazoo County
Company K - (Lawrence Rifles; also listed as Co. C) - raised in Lawrence 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 ‘Mississippi 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.
- Mississippi in the Civil War describes many Confederate and Union sources, specifically for Mississippi, 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.
- Rowland, Dunbar, Military History of Mississippi, 1803-1898: taken from the Official and statistical register of the State of Mississippi, 1908 (Spartanburg, South Carolina: Reprint Company).
- Howell, H. Grady, For Dixie Land, I’ll Take My Stand!: A Muster Listing of All Known Mississippi Confederate Soldiers, Sailors, and Marines (Chickasaw Bayou Press, 1998).
- National Park Service, The Civil War Soldiers and Sailors System (accessed 11 January 2011)