Battle of the Monitor and Merrimack, also called Battle of Hampton Roads, (March 9, 1862), in the American Civil War, naval engagement at Hampton Roads, Virginia, a harbour at the mouth of the James River, notable as history’s first duel between ironclad warships and the beginning of a new era of naval warfare. Monitor and the Merrimack (C.S.S. Virginia) during the American Civil War (1861-65) and was history's first naval battle between ironclad warships.It was part of a Confederate effort to break the Union blockade of Southern ports, including Norfolk and Richmond, Virginia, that had been imposed at the start of the war.