In 1840, Episcopal's student body tripled in size to accommodate more than 100 boys. It continued to grow until the Civil War, when it closed immediately after Union Army forces occupied Alexandria in 1861. Some 500 students served as soldiers in the war, many like Rev. Pendleton (who became a brigadier general) for the Confederacy. For the next five years, school buildings served as part of a large hospital for Union troops. Poet Walt Whitman served as a nurse in the hospital.
