Fortifications

Built on the estate of George W. Young the battery protected a large Union cavalry depot. Its guns and those of its adjacent fort also swept the Potomac River opposite Alexandria, ready to prevent an attack on the Washington Arsenal and Navy Yard. In addition to the fortifications, the area became an administrative center that included drill grounds, hospitals, and tents for Provost Guards. In 1866, the nearby fort was turned over to the Signal Corps.

There are no remains of the fort but poorly preserved earthwork remnants of the battery can be found on Martin Luther King Jr. Blvd just north of South Capital St. SE. The installation was named for Major General Samuel Sprigg Carroll, a native Washingtonian and graduate of West Point.