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.
Arlington National Cemetery
In January 2013, the County Manager of Arlington County, Virginia, and the Executive Director of the Army National Military Cemeteries (consisting of Arlington National Cemetery and the United States Soldiers' and Airmen's Home National Cemetery) signed a memorandum of understanding (MOU) between the Arlington County Board and the Department of the Army to expand the cemetery even further. Under the tentative plan, Arlington County would give up the easement for Southgate Road (which lies between the Navy Annex property and the cemetery's 2012 boundary), and obtain a narrow easement along the southwest border of the Navy Annex site for a new Southgate Road. In exchange, the Department of Defense would give the Navy Annex parking lot to the county.