Confederates Soldiers Killed During the Battle of Gettysburg in Unfinished Graves Dug by Their Comrades on the Rose Farm (1863)

Confederates soldiers killed during the Battle of Gettysburg in unfinished graves dug by their comrades on the Rose Farm, July 1863. By Timothy O'Sullivan. Animated stereoscopic photographs.

Source.

The Graves of Soldiers Near a Hospital at City Point, Virginia

Two view of the graves of soldiers near a hospital at City Point, Virginia, c. 1864.  Attributed to Mathew Brady. Animated stereoscopic photographs.

Source 1.
Source 2.

Two Young Soldiers Kneeling Over Graves on the First Battle of Bull Run Battlefield near Sudley Church (1862)

Two young soldiers kneeling before graves on the First Battle of Bull Run battlefield near Sudley Church, March 1862. By George Barnard. Animated stereoscopic photographs.

Source.