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In this photo provided by the Library of Congress, 110th Pennsylvania regiment at Falmouth, Va., April 24, 1863, nearly annihilated at Battle of Chanc...

In this photo provided by the Library of Congress, President Abraham Lincoln's Gettysburg Address, in Gettysburg, Pa., on Nov. 19, 1863. (AP Photo/Lib...

In this photo provided by the Library of Congress, Major General Philip Sheridan and his generals in front of Sheridan's tent in 1864, location unknow...

In this photo provided by the Library of Congress, wounded soldiers from the Battle in the "Wilderness" at Fredericksburg, Va., May 20, 1864. (AP Phot...

In this photo provided by the Library of Congress, Confederate prisoners captured at the Battle of Fisher's Hill, Va., in September 1864, sent to the...

In this photo provided by the Library of Congress, Ford's Theatre, scene of the assassination of President Abraham Lincoln, in Washington, D.C., in 18...

In this photo provided by the Library of Congress, President Abraham Lincoln, seated and holding his spectacles and a pencil on Feb. 5, 1865. (AP Phot...

In this photo provided by the Library of Congress, Frank M. Welch, African-American, Maj. Cmdg 5th Battalion, CNG, shown in Bridgeport, Ct., circa 188...

In this photo provided by the Library of Congress, Gen. Pierre G.T. Beauregard, an officer of the Confederate Army, shown sometime between 1860 and 18...

In this photo provided by the Library of Congress, Maj. Gen. George B. McClellan, officer of the Federal Army, and his wife, Ellen Mary Marcy, shown s...

In this photo provided by the Library of Congress, Brig. Gen. William W. Averell, officer of the Federal Army, shown sometime between 1860 and 1870, l...

In this photo provided by the Library of Congress, Maj. Gen. William S. Rosecrans, officer of the Federal Army, shown sometime between 1860 and 1865,...

In this photo provided by the Library of Congress, Gen. Robert E. Lee, commander of the Confederate Army during the Civil War, shown between 1860 and...

In this photo provided by the Library of Congress, Gen. James Longstreet, an officer of the Confederate Army, shown sometime between 1860 and 1870, lo...

In this photo provided by the Library of Congress, Maj. Gen. John M. Schofield, officer of the Federal Army, shown sometime between 1860 and 1865, loc...

In this photo provided by the Library of Congress, Admiral David Glasgow Farragut, officer of the Federal Army circa 1862. (AP Photo/Library of Congre...

In this photo provided by the Library of Congress, General Sherman's troops are shown removing ammunition from Fort McAllister, near Savannah, Ga., in...

In this photo provided by the Library of Congress, view of the town and railroad bridge in Harper's Ferry, West Virginia between September 17 and Octo...

In this photo provided by the Library of Congress, a dead Confederate sharpshooter in "the devil's den," Gettysburg, Pa., in July 1863. (AP Photo/Libr...

In this photo provided by the Library of Congress, winter quarters at Brandy Station, Va., in December 1863. Left to right: Capt. Samuel A. McClellan,...

In this photo provided by the Library of Congress, a view of a store front with a sign reading "Auction & Negro Sales," on Whitehall Street in Atlanta...

In this photo provided by the Library of Congress, Federal troops are shown in a Confederate fort in Atlanta, Ga., in 1864. (AP Photo/Library of Congr...

In this photo provided by the Library of Congress, Gen. William T. Sherman, leaning on breach of gun, and staff at Federal Fort No. 7 in Atlanta, Ga.,...

In this photo provided by the Library of Congress, Gen. William T. Sherman shown on horseback at Federal Fort No. 7 in Atlanta, Ga., in 1864. (AP Phot...

In this photo provided by the Library of Congress, general view of the burned district in Richmond, Va., in April 1865. (AP Photo/Library of Congress/...

In this photo provided by the Library of Congress, President Abraham Lincoln's funeral on Pennsylvania Avenue in Washington, D.C., on April 19, 1865....

In this photo provided by the Library of Congress, General George Crook, officer of the Federal Army, shown between 1870 and 1880. (AP Photo/Library o...

In this photo provided by the Library of Congress, the everyday routine of camp life of the 31st Penn. Inf. (later, 82d Penn. Inf.) at Queen's farm, v...

In this photo provided by the Library of Congress, an artillery unit rides down Pennsylvania Avenue near the Treasury in Washington, D.C., during the...

In this photo provided by the Library of Congress, President Abraham Lincoln's funeral procession is seen along Pennsylvania Avenue, Washington, D.C.,...

In this photo provided by the Library of Congress, Abraham Lincoln is pictured in a three-quarter length portrait, seated and holding his spectacles a...

In this photo provided by the Library of Congress, Major General Nathaniel P. Banks, officer of the Federal Army, faces left for a full-length portrai...

In this photo provided by the Library of Congress, the monument erected on the battlefield of Shiloh, Murfreesboro, Tenn., 1863, is visible. (AP Photo...

In this photo provided by the Library of Congress, General Irvin McDowell, officer of the Federal Army during the Civil War, sits for a portrait some...

In this photo provided by the Library of Congress, encampments and earthworks at Fort Burnham, Va., are pictured between 1860 to 1865 during the Civil...

In this photo provided by the Library of Congress, Gen. George Custer stands for a portrait some time between 1860 to 1865. Location is unknown. (AP P...

In this photo provided by the Library of Congress, an interior view of a slave pen in Alexandria, Va., is pictured some time between 1861 to 1869. (AP...

In this photo provided by the Library of Congress, a group of African Americans on J.J. Smith's plantation, Beaufort, S.C., pose for a photograph in 1...

In this photo provided by the Library of Congress, Lt. George A. Custer of the Union Army is pictured with a dog at the Virginia Peninsula, Va., 1862,...

In this photo provided by the Library of Congress, anchored supply vessels at White House Landing, Va., are seen from a view down river, May-August 18...

In this photo provided by the Library of Congress, 20-pdr. v Parrott rifled guns of the 1st New York Battery are pictured in Richmond, Va., June 1862,...

**EDS NOTE: GRAPHIC CONTENT** In this photo provided by the Library of Congress, the bodies of dead Confederate soldiers have been gathered for burial...

In this photo provided by the Library of Congress, General Ambrose E. Burnside, officer of the Federal Army, stands with two unidentified staff office...

**EDS NOTE: GRAPHIC CONTENT** In this photo provided by the Library of Congress, a dead Confederate soldier lies in "the devil's den" in Gettysburg, P...

In this photo provided by the Library of Congress, the camp of the Tennessee Colored Battery is pictured during the Siege of Vicksburg at Johnsonville...

In this photo provided by the Library of Congress, seven African-American "contraband" teamsters dressed in old Union uniforms stand in front of a wag...

In this photo provided by the Library of Congress, a group of men pause for a photograph during the Battle of Chattanooga, September-November 1863, in...

In this photo provided by the Library of Congress, the Federal outer line of the Battle of Nashville, Civil War, is pictured on Dec. 16, 1864. (AP Pho...

In this photo provided by the Library of Congress, the monitor U.S.S. Onondaga is seen in the background, while soldiers sit in a rowboat in foregroun...

In this photo provided by the Library of Congress, the battered smokestack from C.S.S. ironclad ram Virginia II is pictured circa 1865. Location is un...