• !5-inch Rodman Cannon

    Civil War Defenses of Washington

    District of Columbia

Operating Hours & Seasons

The National Park Service Civil War Defenses of Washington sites are open every day except January 1, Thanksgiving, and December 25. The hours of operation are from dawn to dusk. Please contact each park for more information.

Did You Know?

Denis Hart Mahan

The design for the Defenses of Washington was based on a textbook published in 1836 called A TREATISE ON FIELD FORTIFICATIONS, by Dennis Hart Mahan. Mahan was a professor of civil and military engineering at West Point.