National Archives and Records Administration. Military Resources: Civil War.
In the United States, the National Archives is the largest repository of documents relating to Union and Confederate military operations, military service of individuals, Federal and Confederate government activities during the war, political activities, intelligence, diplomacy, and photographs.
National Park Service. Civil War. Soldiers and Sailors System.
This web site provides a guide to Civil War resources under the management of the National Park Service by promoting the National Park Service heritage sites. There are links to a state-by-state listing of Civil War battlefields, national parks, and cemeteries, as well as several searchable databases such as The Civil War Soldiers and Sailors System for records of Union and Confederate soldiers and units. Another database provides medal citations for recipients of the Medal of Honor, and there are searchable records of several Union and Confederate prisons.
The American Civil War Homepage.
There are twelve major topics on this web site to which one may refer, with updates noted: General Resources; Biographical Information; State/Local Studies-by State; Other Military Information; The Secession Crisis and Before; Histories and Bibliographies; Battles and Campaigns; Civil War Researchers; Images of Wartime; Documentary Records; Rosters & Regimental Histories; and Civil War Round Tables.
The Civil War Archive.
This web site has a growing collection of Civil War documents including transcriptions of soldiers’ letters and diaries, battle reports, regimental histories from Dyer’s Compendium of the War of the Rebellion, and corps histories. Updates are noted.
Documenting the American South.
The University of North Carolina at Chapel Hill Academic Affairs Library has developed this web site to provide “access to digitized primary materials that offer Southern perspectives on American history and culture. It supplies teachers, students, and researchers at every educational level with a wide array of titles they can use for reference, studying, teaching, and research.” Primarily, the documents are from libraries at the university, and many of them relate to the Civil War.
The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies.
Cornell University’s Making of America project has digitized the entire multi-volume publication, Official Records printed series. It is searchable by keyword.
Washington Civil War Association: Campaigning: Drill and Military Links.
Links to various tactical guides, drill manuals, and related information for the Civil War.
Online Drill and Military Manuals.
Various cavalry and infantry drill and tactical manuals.
Civil War Surgery Manuals, Thomas Jefferson University.
Manuals of military field surgery during the war.