The term 'Man of War' is a term used to describe a powerful warship, usually a BATTLESHIP. The term can also refer to the person in command of such a vessel. The crossword solutions for this term are 'BATTLESHIP' and 'Henry Shrapnel', both of which refer to famous naval vessels. The BATTLESHIP was a large, heavily armed warship used by many navies throughout history, while Henry Shrapnel was an English artillery officer who invented a type of artillery shell.