• [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.

    • Contributor: Sneden, Robert Knox
    • Original Format: Maps
    • Date: 1861
  • Map showing positions of Union and Rebel forces Septr 1861.

    Depicts the area between Lewinsville, in Fairfax County, and Georgetown in the north, and Alexandria in the south. The location of the Loudoun and Hampshire Railroad is also indicated.

    • Contributor: Sneden, Robert Knox
    • Original Format: Maps
    • Date: 1861
  • Contours of Union forts on south side of Potomac, 1862 [map].

    This map shows the names and configurations of Union fortifications on the Virginia side of the Potomac River in 1862, and in some cases lists the name of the regiment that built the structure.

    • Contributor: Sneden, Robert Knox
    • Original Format: Maps
    • Date: 1861
  • Topographical map of Washington, D.C., and vicinity. Showing the Union forts and defences built 1861-3.

    Detail from a printed map of the Potomac River region of Maryland and Virginia, and including Washington, D.C., which Sneden has annotated to show the locations of Union forts and picket lines.

    • Contributor: Sneden, Robert Knox
    • Original Format: Maps
    • Date: 1861