CSS Manassas, formerly the steam icebreaker Enoch Train, was built in 1855 by James O. Curtis as a twin-screw towboat at Medford, Massachusetts. A New Orleans commission merchant, Captain John A. Stevenson, acquired her for use as a privateer after she was captured by another privateer CSS Ivy. Her fitting out as Manassas was completed at Algiers, Louisiana; her conversion to a ram of a radically modern design made her the first ironclad ship built for the Confederacy.