Battery Carroll and Fort Greble
Battery Carroll and Fort Greble were two defense sites north of the Potomac that guarded the gateway to Washington during the Civil War. Their guns not only swept the Potomac opposite Alexandria, standing ready to prevent attack on the Washington Arsenal and Navy Yard, but also the ravines of Oxon Run giving access to the roads leading to Washington.
When Congress ordered the closing of the defenses, Fort Greble was offered to Thomas W. Berry who held the property in trust for heirs "unknown."
Did You Know?
When the Civil War began, Fort Washington was the only existing fortification for the capital's defense. Fort Washington, nearly 12 miles down the Potomac, was built to guard against enemy ships during the War of 1812.