The USS Roanoke was a Merrimack-class steam screw frigate built at the Gosport Navy Yard. The frigate was commissioned in 1857 and became the flagship of the Home Squadron. When the Civil War erupted, Roanoke captured several blockade runners and fought during the March 1862 Battle of Hampton Roads. Noting how the Confederates had transformed Merrimack into the ironclad CSS Virginia, the wooden Roanoke was converted into an ironclad at the Brooklyn Navy Yard. The new Roanoke featured three turrets; however, the extra weight of the iron made the vessel unstable and it spent the rest of the war in Hampton Roads, Virginia, and was scrapped in 1883.
A Novel Example of Naval Architecture