12th Regiment, Virginia Infantry (Confederate)
12th Regiment, Virginia Infantry was organized at Norfolk, Virginia, in May, 1861, using the 4th Battalion Virginia Volunteers as its nucleus. Its members were from Petersburg, Richmond, Hicksford, and Norfolk.
Of the 348 engaged at Gettysburg, only four percent were disabled. It surrendered 12 officers and 177 men. The field officers were Colonels Everard M. Feild and David A. Weisiger; Lieutenant Colonels John R. Lewellen and Fielding L. Taylor; and Majors Edgar L. Brockett, Richard W. Jones, and John P. May. 
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 (Petersburg City Guard) - many men from Petersburg, Virginia
Company B ( Petersburg Old Grays) - many men from Petersburg, Virginia
Company C (Petersburg New Grays) - many men from Petersburg, Virginia
Company D (Lafayette Guards) - many men from Petersburg, Virginia
Company E (Petersburg Riflemen) - many men from Petersburg, Virginia
Company G (Richmond Grays) (formerly Company A of the 1st Virginia
Company H (Norfolk Juniors) - many men from Norfolk, Virginia
Company K (Archer Rifles) many men from Petersburg, Virginia
The information above is from 12th Virginia Infantry, by William D. Henderson
- Bernard, George S. The Battle of the Crater in Front of Petersburg, July 30, 1864, A Memorable Day in History: An Address Delivered before the A.P. Hill Camp of Confederate Veterans, Petersburg, Va., in that City, on the 24th of June 1890. Petersburg, Va.: Petersburg Index-Appeal Presses, 1890. FHL Fiche 6082843.
- Brown, Philip F. Reminiscences of the War of 1861-1865. Roanoke, Va.: Union Printing Co., 1912. FHL Fiche 6082845 (2 fiche).
- Grand Army of the Republic. John A. Andrew Post, No. 15 (Boston, Mass.). The Old Stars and Stripes of the Richmond Grays, and the Grays in the Confederate Army. 1887?. FHL Fiche 6082846.
- Henderson, William D. 12th Virginia Infantry. Lynchburg, Va.: H.E. Howard, 1894. FHL Book 975.5 M2vr v. 8.
- Keiley, A.M. Prisoner of War, or, Five Months Among the Yankees: Being a Narrative of the Crosses, Calamities, and Consolations of a Petersburg Militiaman During an Enforced Summer Residence North. West & Johnson, 1865? Digital version at Internet Archive; FHL Fiche 6082848 (2 fiche).
- Keiley, A.M. In Vinculis, or, The Prisoner of War: Being the Experience of a Rebel in Two Federal Pens, Interspersed with Reminiscences of the Late War, Anecdotes of Southern Generals, etc. New York: Blelock & Co., 1866. Digital version at Internet Archive; FHL Fiche 6082847 (3 fiche).
- Turner, John R. The Battle of the Wilderness: The Part Taken by Mahone's Brigade: An Address Delivered by John R. Turner Before A.P. Hill Camp of Confederate Veterans of Petersburg, Va., on the Evening of March 3, 1892. Petersburg, Va.: Fenn & Owen, Printers and Binders, 1892? FHL Fiche 6082849.
- National Park Service, The Civil War Soldiers and Sailors System, (accessed 6 December 2010).