History lovers have been transfixed for decades by the clash of the ironclads that erupted at the Battle of Hampton Roads. But one question remains unanswered for many: Why do some people refer to CSS Virginia as Merrimac? And what's more: Why is Merrimac sometimes spelled with a "k" at the end and sometimes without?

After a gun demonstration at a swanky event turned deadly, the US Navy had no interest in revisiting the production of large shell guns. But when John A.B. Dahlgren, known as the “Father of Naval Ordinance,” developed a new style of naval shell gun known as the Dahlgren gun, these weapons would eventually be mounted onto Monitor and taken into battle against CSS Virginia.

The Confederate ironclad that fought in Hampton Roads on March 8-9, 1862 had a mixed armament of shell guns, rifled guns, hot shot guns, howitzers, and a ram. This ship was designed to destroy Union wooden warships using these weapons, and successfully did so on March 8. Confederate Secretary of the Navy Stephen Russell Mallory and Naval Scientist Lieutenant John Mercer Brooke were two of the masterminds behind the outfitting of the well-equipped ironclad.