3rd Battalion, Mississippi Infantry
3rd (Williams') Infantry Battalion, formerly the 45th Regiment, Mississippi Infantry, was organized in July, 1864 with five companies. Surrendered on April 26, 1865. The field officers were Lieutenant Colonel John D. Williams and Major Elisha F. Nunn. 
45th Infantry Regiment was formed during the late summer of 1862 by redesignating Hardcastle's 33rd Mississippi Infantry Regiment. For a time it was consolidated with the 32nd Regiment. On July 14, 1864, it was consolidated into five companies and became known as the 3rd (Williams') Mississippi Infantry Battalion. Colonel Aaron B. Hardcastle, Lieutenant Colonel Richard Charlton, and Major Elisha F. Nunn were in command.
33rd (Hardcastle's) Infantry Regiment [including the 3rd (Hardcastle's) Mississippi Infantry Battalion] was organized during the late spring of 1862. Later it was redesignated the 45th Mississippi Infantry Regiment. Colonel Aaron B. Hardcastle, Lieutenant Colonel Richard Charlton, and Major Theodore A. Jones were in command.
- The 45th Mississippi Infantry (aka 3rd Battalion MS Infantry[Hardcastle’s/Williams’, & aka 33rd MS Infantry [Hardcastle’s]) ]Internet site has a longer history taken from Dunbar Rowland's Military History of Mississippi, 1803-1898.
- David Williamson. The Third Battalion Mississippi Infantry and the 45th Mississippi Regiment : a Civil War history. (Jefferson, North Carolina : McFarland & Co., c2004) FHL Book976.2 M2wt
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.
COMPANIES COMPRISING THE 3RD BATTALION MISSISSIPPI INFANTRY:
3rd Bn. Mississippi Infantry Internet site has a battalion roster arranged alphabetically within each company. This includes companies H and I of the 45th regiment shown below.
Company A - (Duncan Riflemen) - raised in Simpson County
Company C - (Raymond Minute Men) - raised in Hinds County
Company D - (Choctaw Rough & Ready Company) - raised in Choctaw County
Company E - (McNair Rifles, aka Pike County Rifles) - raised in Pike County
Company F - (Tippah Highlanders) - raised in Tippah County
Company G - (Mississippi Volunteers) - raised in Pontotoc County
Company K [sic] - (Capt. Charlton’s Independent Company) - raised in Hinds County
COMPANIES COMPRISING THE 45TH MISSISSIPPI INFANTRY:
The 45th Regiment Infantry was made up of the companies of the 3rd Battalion listed above; and in addition to companies H and I below:
Company H - (Capt. Roberts’ Company) [27th Alabama Infantry] - raised in Alabama
Company I - (Capt. Wright’s Company) [27th Alabama Infantry] - raised in Alabama
- 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.
- Civil War Soldiers and Sailors System can be searched by soldier's name or by regiment; includes regimental rosters and additional history of the regiment.
- 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)