United States v. Lee (1882)
With local cemeteries in Alexandria County and Alexandria filling rapidly with war dead, Quartermaster General of the United States Army Montgomery C. Meigs proposed using of the Arlington estate as a cemetery. The first burial there was made on May 13, 1864. United States Secretary of War Edwin M. Stanton approved the establishment of a military cemetery on June 15, 1864, creating Arlington National Cemetery. By the end of the war in April 1865, more than 16,000 people had been buried at Arlington. In September 1866, a memorial and a burial vault (containing the remains of 2,111 U.S. and Confederate soldiers who died at the First Battle of Bull Run, Second Battle of Bull Run, and along the Rappahannock River) were buried in Lee's former wildflower garden on the mansion's east side beneath the Civil War Unknowns Monument, a memorial to honor unknown soldiers who had died during the American Civil War.
List of memorials and monuments at Arlington National Cemetery
In May 2014, Arlington National Cemetery officials renamed the Old Amphitheater, rededicating it as the James R. Tanner Memorial Amphitheater. Tanner, a Union Army veteran, lost both legs during the American Civil War. He became a stenographer and clerk with the War Department, and took down most of the eyewitness testimony during the early hours of the investigation into the assassination of Abraham Lincoln. Tanner is buried a few yards from the amphitheater.