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. The Pendleton Hall at Episcopal has a memorial to the 68 student/alumni who died fighting for the Confederacy.