This vintage illustrated poster depicts the Battle between the Monitor and the Merrimac(k) during the Civil War. The battle dates to March 9, 1862.

The Battle of Hampton Roads, often referred to as the Battle of Monitor and Merrimack (or Merrimac), was the most noted and arguably the most important naval battle of the American Civil War from the standpoint of the development of navies. It was fought over two days, March 8-9, 1862, in Hampton Roads, a roadstead in Virginia where the Elizabeth and Nansemond Rivers meet the James River just before it enters Chesapeake Bay. The battle was a part of the effort of the Confederacy to break the Union blockade, which had cut off Virginia's largest cities, Norfolk and Richmond, from international trade.

The major significance of the battle is that it was the first meeting in combat of ironclad warships. The Confederate fleet consisted of the ironclad ram CSS Virginia (the Merrimack) and several supporting vessels. On the first day of battle, they were opposed by several conventional, wooden-hulled ships of the Union Navy. On that day, Virginia was able to destroy two ships of the Federal flotilla and threaten a third, USS Minnesota which had run aground. The action was halted by darkness and falling tide, so Virginia retired to take care of her few wounded — which included her captain, Flag Officer Franklin Buchanan — and repair her minimal battle damage. 

Historical references courtesy of wikipedia.org