(1817–64), Confederate spy. Born in Washington, D.C., Greenhow was raised as a Southerner and spied for the Confederacy during the American Civil War. She used couriers to send messages to the Confederate government regarding Northern troop movements and battle plans during the early part of the war. She was arrested, tried for treason, and exiled to the South in 1862. After attempting to collect money from England for the South, she was shipwrecked on the way home and drowned. (See also Civil War, American; Espionage.)