The unsung heroes of the naval war in the Western theater weren’t the city class casemate ironclads, but a much larger and more active fleet of more than seventy, much smaller, lightly armored vessels. The “Tinclads” of the US Civil War deserve to be remembered.
An epithet is a byname, a characterizing word or phrase that accompanies or occurs in place of the name of a person or thing. Historically, some have been unfortunate- just ask Alfonso the Slobberer or Eystein Foul-Fart.