Warburton Manor occupied a high Potomac River site in Prince George’s County, Maryland, opposite the Virginia shore near Mount Vernon. The Digges family held the property for generations after a seventeenth-century patent and developed it as a plantation seat tied to river travel, agriculture, and elite colonial society. Its operation depended on enslaved labor, a fundamental part of the wealth and hospitality represented in later accounts of the manor and its prominent visitors.

George and Martha Washington maintained close social relations with members of the Digges family and visited Warburton on multiple occasions. Washington often crossed the Potomac in this vicinity while traveling from Mount Vernon toward Annapolis, Upper Marlborough, and other Maryland destinations. The marker particularly remembers his forty-third birthday, February 22, 1775, spent at Warburton. That visit occurred during the mounting imperial crisis, only weeks before armed conflict began at Lexington and Concord.

No major Revolutionary battle is documented at the manor. Its wartime importance is best understood through the interconnected Chesapeake world of plantations, ferries, roads, correspondence, and political relationships. Families on both banks of the Potomac supplied provisions, public officials, militia service, and information while confronting disrupted trade and the possibility of British naval activity. Warburton’s relationship with Washington makes the site biographically significant without turning a social visit into an unrecorded military episode.

The landscape later gained a very different strategic purpose. After negotiations with the Digges family, the United States acquired part of the property in 1808 for a fort protecting the approach to the new national capital. Fort Warburton was completed in 1809 and destroyed by its American garrison during the British advance up the Potomac in August 1814. The present Fort Washington developed afterward, preserving the site’s continuing importance for river defense.

The marker combines these layers: the vanished Digges manor, Washington’s personal association, and the later federal fortifications. Its reference to a fort designed by Pierre Charles L’Enfant belongs to the post-Revolutionary defense of Washington, not to the War for Independence. Read carefully, the location illustrates how one commanding bluff changed from a plantation and ferry-connected household into a military reservation while retaining the memory of the people—free and enslaved—who lived and worked there.

Today, the location also invites comparison between commemorated visits by famous guests and the less visible daily lives that sustained the estate. Roads, landing places, archaeological evidence, and later fort construction can help recover that broader landscape even though the manor house is gone. The marker is most useful when it opens inquiry into both Washington’s network and the plantation community beyond him.