Fort Lyon, near Alexandria, Virginia
The map shows a close up drawing of Fort Lyon located on Eagle Hill in Alexandria, Virginia. Shows the fort's defenses, including abatis, ditches, salients, sally port, and bomb proof.
Sneden, Robert Knox
[Map of Alexandria, Virginia]
Illustrates Alexandria's central position in the defense of Washington, where at least 12 outlying forts surrounded the city. Military camps of various Union officers such as Samuel Peter Heintzelman are indicated on this map.