Fort Myer

Fort Myer is the previous name used for a U.S. Army post next to Arlington National Cemetery in Arlington County, Virginia, and across the Potomac River from Washington, D.C. Founded during the American Civil War as Fort Cass and Fort Whipple, the post merged in 2005 with the neighboring Marine Corps installation, Henderson Hall, and is today named Joint Base Myer–Henderson Hall.

In 1861, the land that Fort Myer would eventually occupy was part of the Arlington estate, which Mary Anna Custis Lee, the wife of Robert E. Lee, owned and at which Lee resided when not stationed elsewhere (see Arlington House, The Robert E. Lee Memorial). When the Civil War began, the Commonwealth of Virginia seceded from the United States, Lee resigned his commission, and he and his wife left the estate. The United States Government then confiscated the estate and began to use it as a burial ground for Union Army dead (see Arlington National Cemetery), established the Freedman's Village settlement on Arlington's grounds that provided housing and education for emancipated contraband, and built forts and other defenses within the vicinity along the Arlington Line of the Civil War defenses of Washington (see Washington, D.C., in the American Civil War).

Shortly after the Union Army's rout at the First Battle of Bull Run (Manassas) in late July 1861, the Army constructed in August 1861 a lunette (Fort Ramsay) on the future grounds of Fort Myer. One of the first fortifications built on the Arlington Line, the lunette was located at and near the present post's Forest Circle. Later renamed to Fort Cass, the lunette had a perimeter of 288 yards (263 m) and emplacements for 12 guns.

A May 17, 1864, report from the Union Army's Inspector of Artillery (see Union Army artillery organization) noted the following:

Fort Cass, Maj. N. Shatswell commanding.–Garrison, two companies First Massachusetts Heavy Artillery—8 commissioned officers, 1 ordnance-sergeant, 220 men. Armament, three 6-pounder field guns (smooth), five 20-pounder Parrotts (rifled), three 24-pounder siege guns (smooth), one 24-pounder F. D. howitzer (smooth), one 24-pounder Coehorn mortar. Magazines, two; dry and in good condition. Ammunition, full supply, well packed and in serviceable condition. Implements, complete and serviceable. Drill in artillery, fair. Drill in infantry, fair. Discipline, fair. Garrison sufficient for the work.

Although the Army abandoned the lunette in 1865 at the end of the Civil War, the United States War Department continued to control its property.

Following the Union Army's defeat at the Second Battle of Bull Run (Manassas) in August 1862, the Army constructed Fort Whipple on the grounds of the former Arlington estate during the spring of 1863. The fort was located a short distance southeast of Fort Cass. The Army named the fort after Brevet Major General Amiel Weeks Whipple, who died in May 1863 of wounds received during the Battle of Chancellorsville. The fort was considered to be one of the strongest fortifications erected for the defense of Washington during the Civil War. It had a perimeter of 658 yards and places for 43 guns.

The May 17, 1864, report from the Union Army's Inspector of Artillery noted the following: