It was quickly rebuilt after the war at the request of President Monroe.
Famed architect Pierre L'Enfant oversaw construction of the new brick and masonry fort in the shape of a star. It had two layers of triangular bastions for overlapping cannon and musket fire. Its guns were either inside the walls or on the top of the parapet.
The fort remained that way through the Civil War.
It was continually expanded upon in the 19th and 20th centuries. Looking at the fort, one can see the continuous progression of generations of military fort defensive architecture.