He initially served at Valley Forge under General George Washington.
Later, he served under General Casimir Pulaski at the Siege of Savannah, where he was badly wounded in the leg. He was captured at Charleston but returned to the army after a period of parole.
After the war, L’Enfant became a member of, and designed the insignia and diploma for, the Society of the Cincinnati, a prestigious fraternal organization of officers in the Continental Army. When the nation’s capital was moved to Washington, D.C., George Washington hired L’Enfant to design the city. L’Enfant was dismissed a year later because he refused to follow orders from the District of Columbia Commissioners. However, much of his original plan was used and the city has kept the design intact.
Originally buried in Prince Georges County, Maryland, L’Enfant’s remains were removed to Arlington National Cemetery on April 28, 1909.