 Complete the following phrase:  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, to house freed slaves Freedmens Village, and for military purposes, including the Civil War defenses of Washington see 