Civil War maps
Maps of the American Civil War from the Library of Congress's Civil War map collection: battlefield surveys of Gettysburg, Antietam, Fredericksburg and Vicksburg, campaign maps, fortifications, and Robert Knox Sneden's watercolour maps of camps and prisons.
Why they are free to use: Published in the 1860s or made by the US Army: no US copyright. Each map's page shows its own licence basis and a credit line.
Gettysburg
Search “Battle of Gettysburg map troop positions July 1863” for more, or ask Claude for it

The battlefield of Gettysburg, July 1st, 2nd and 3rd, 1863
1905 · Library of Congress

Battle of Gettysburg, Penna. Showing positions held 1st and 3rd July 1863.
1863 · Library of Congress

Copy of official plan of Gettysburg. Pennsylvania, fought 1st, 2nd, 3rd July 1863.
July 1, 1863 · Library of Congress

Gettysburg and vicinity, showing the position of the troops July 1st and 3rd, 1863, and the land purchased and dedicated to the public by General S. Wylie Crawford and the Gettysburg Battlefield
1863 · Library of Congress

Map of the battle field of Gettysburg. (July 1st, 2nd, and 3rd 1863)
1864 · Library of Congress

Gettysburg battle-field. Battle fought at Gettysburg, Pa., July 1st, 2d & 3d, 1863 by the Federal and Confederate armies, commanded respectively by Genl. G. G. Meade and Genl. Robert E. Lee / Contributor Names: Bachelder, John B. (John Badger), 1825-1894. Created / Published: Boston and New York: J
c. 1863 · Library of Congress

Battle of Gettysburg - showing the position of the two contending armies during the first, second & third of July 1863.
1863 · Library of Congress

Plan of the Gettysburg battle ground.
1863 · Library of Congress
Antietam
Search “Battle of Antietam map Sharpsburg 1862” for more, or ask Claude for it

Map of the battlefield of Antietam, (Sept. 17, 1862)
1862 · Library of Congress

Battle of the Antietam.
September 17, 1862 · Library of Congress

Plan of the Battle of Antietam, Maryland. Sept 1862
September 16, 1862 · Library of Congress

Battle of Antietam, Md.
1862 · Library of Congress

Antietam Sharpsburg and vicinity. Constructed and engraved to illustrate "The war with the South
1864 · Library of Congress

Map of the battlefield of Antietam
1862 · Library of Congress

The Battle of Antietam, September 17, 1862.
1862 · Library of Congress

Map of the Battle of Antietam
1818–1947 · U.S. National Archives
Vicksburg
Search “siege of Vicksburg map 1863” for more, or ask Claude for it

Map of the Siege of Vicksburg, Mississippi
1863 · U.S. National Archives

Map of the rebel position at Vicksburg, Miss., May 1863.
1863 · Library of Congress

The siege of Vicksburg, its approaches by Yazoo Pass and other routes
1863 · Library of Congress

Tomlinson's map of Vicksburg, showing all the surrounding fortifications, batteries, principal plantation, etc.
1863 · Library of Congress

Map of the siege of Vicksburg, Miss.
1863 · Library of Congress

Map of the siege of Vicksburg, Miss.
1863 · Library of Congress

View of Vicksburg and plan of the canal, fortifications & vicinity
1863 · Library of Congress

The Enemy's fortifications around Vicksburg
1863 · Library of Congress
Sherman's campaigns
Search “map of Sherman's Atlanta campaign and march to the sea 1864” for more, or ask Claude for it

Map Illustrating the March of the Army Commanded by General W. T. Sherman from Atlanta to Savannah, GA
1818–1947 · 2 sheets

Map Illustrating the March of the Army under Command of Major General William T. Sherman
1818–1947 · U.S. National Archives

General Sherman's campaign war map. Bufford 1864
1864 · Wikimedia Commons

Sherman's march from Atlanta to the sea. Drawn from official map of Brig. Genl. O. M. Poe, Chief Engineer.
November 15, 1864 · Library of Congress

Map showing Genl. Sherman's march from Chattanooga to Atlanta.
1864 · Library of Congress

Military map showing the marches of the United States forces under command of Maj. Genl. W. T. Sherman, U.S.A., during the years 1863, 1864, 1865.
1865 · Library of Congress

Map Illustrating the March of the Army under command of Major General W. T. Sherman from Savannah, Georgia to Raleigh, North Carolina in the months of January, February, March, & April, 1865
1865 · U.S. National Archives

Map showing route of marches of the army of Genl. W.T. Sherman, from Atlanta, Ga. to Goldsboro, N.C. - To accompany the report of operations from Savannah, Ga. to Goldsboro, N.C.
1865 · Library of Congress
Fortifications
Search “map of Civil War fortifications and defenses” for more, or ask Claude for it

This map of Confederate defenses surrounding Richmond was recovered by Union forces from the body of Brigadier General on August 16, 1864
1911 · Wikimedia Commons

Map of the fortifications within the District of Columbia.
1862 · Library of Congress

Map of Richmond, Va., and surrounding country showing Rebel fortifications
1864 · Library of Congress

A complete map of Richmond and its fortifications within a circle of 12 miles showing the numerous forts, batteries and the range of their fire, and the various obstacles that impede the approach of
1863 · Library of Congress

Guide leaflets for the tour of historic Civil War defenses, Washington D.C.
1861 · Library of Congress

The defenses of Richmond, 1864
1864 · Library of Congress

Map of the defences (sic) of Richmond, Va., April 1865.
1865 · Library of Congress

Map of the environs of Washington - compiled from Boschkes' map of the District of Columbia and from surveys of the U.S. Coast Survey showing the line of the defences of Washington as constructed
1865 · Library of Congress
The theatre of war
Search “map of the seat of war in Virginia and the southern states 1861” for more, or ask Claude for it

Map of the seat of war - (Virginia and Maryland)
1861 · Library of Congress

Map of the seat of war in VA
1861 · Wikimedia Commons

Military map of the middle and southern states showing the seat of war during the great rebellion in 1861
1860 · Library of Congress

Birds eye view of Virginia, Maryland, Delaware, and the District of Columbia the seat of war
1861 · Library of Congress

Military map of the middle and southern states showing the seat of war during the great rebellion in 1861
1860 · Library of Congress

Map of the southern states, including rail roads, county towns, state capitals, county roads, the southern coast from Delaware to Texas, showing the harbors, inlets, forts, and position of blockading
1861 · Library of Congress

Map of the seat of war with the lines of r. roads leading thereto, also the strategical points as laid down
1861 · Library of Congress

Map of the seat of war in Virginia
1861 · Library of Congress
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