Answer: merrimac

AnswerCrossword Clue
MERRIMACMonitor's opponent
MERRIMACHistoric ship.
MERRIMACFrigate of 1862.
MERRIMACHistoric ironclad.
MERRIMACHistoric warship.
MERRIMACCivil War vessel
MERRIMACThe South's ironclad
MERRIMACWarship of 1862