Fort Monroe (also known as the Fort Monroe National Monument) was a military installation in Hampton, Virginia—at Old Point Comfort, the southern tip of the Virginia Peninsula. Within the 565 acres of Fort Monroe are 170 historic buildings and nearly 200 acres of natural resources, including 8 miles of waterfront, 3.2 miles of beaches on the Chesapeake Bay, 110 acres of submerged lands and 85 acres of wetlands. It has a 332 slip marina and shallow water inlet access to Mill Creek, suitable for small watercraft. When it was operational as a United States Army post, Fort Monroe supported a work population of some 3000, including 1000 people in uniform. The major tenant unit was the United States Army Training and Doctrine Command (TRADOC). Along with Fort Wool, Fort Monroe guarded the navigational channel between the Chesapeake Bay and Hampton Roads—the natural roadstead at the confluence of the Elizabeth, the Nansemond and the James rivers. Surrounded by a moat, the seven-sided stone fort is the largest stone fort ever built in the United States. During the initial exploration by the mission headed by Captain Christopher Newport in the earliest days of the Colony of Virginia, the site was identified as a strategic defensive location. In May 1607, they established the first permanent English settlement in the present-day United States about 25 miles further inland from the Bay along the James River at Jamestown. The land area where Fort Monroe is located became part of Elizabeth Cittie in 1619, Elizabeth River Shire in 1634, and was included in Elizabeth City County when it was formed in 1643. Over 300 years later, in 1952, Elizabeth City County and the nearby Town of Phoebus agreed to consolidate with the smaller independent city of Hampton, which became one of the larger cities of Hampton Roads. Beginning by 1609, defensive fortifications were built at Old Point Comfort during Virginia's first two centuries. The first was a wooden stockade named Fort Algernourne. However, the much more substantial facility of stone to become known as Fort Monroe (and adjacent Fort Wool on a man-made island across the channel) were completed in 1834. The principal facility was named in honor of U.S. President James Monroe.Throughout the American Civil War (1861–1865), although most of Virginia became part of the Confederate States of America, Fort Monroe remained in Union hands. It became notable as a historic and symbolic site of early freedom for former slaves under the provisions of contraband policies. For two years thereafter, the former Confederate President, Jefferson Davis, was imprisoned at the fort.