▁execution ▁in ▁the ▁song ▁" The ▁Cro ppy ▁Boy ." ▁A ▁force ▁sent ▁out ▁from ▁the ▁fort ▁to ▁defend ▁W ex ford ▁town ▁was ▁defeated ▁at ▁the ▁Battle ▁of ▁Three ▁Ro cks . ▁ ▁D unc annon ▁continued ▁to ▁be ▁used ▁as ▁a ▁fort ▁by ▁the ▁British ▁Army , ▁being ▁handed ▁over ▁to ▁the ▁Irish ▁National ▁Army ▁only ▁to ▁burn ▁down ▁in ▁ 1 9 2 2 ▁during ▁the ▁Irish ▁Civil ▁War . ▁It ▁was ▁occasionally ▁used ▁by ▁the ▁FC Á ▁( Ar my ▁Reserve ) ▁for ▁summer ▁cam ps ▁before ▁being ▁given ▁to ▁W ex ford ▁County ▁Council ▁in ▁ 1 9 9 3 ▁and ▁later ▁opening ▁as ▁a ▁museum . ▁ ▁Fort ▁ ▁D unc annon ▁Fort ▁is ▁a ▁star ▁fort . ▁Al ong ▁the ▁sides ▁were ▁guns ▁facing ▁up river ▁and ▁down river . ▁On ▁the ▁west ▁end ▁were ▁art illery ▁batter ies ▁facing ▁across ▁the ▁entire ▁in let . ▁ ▁The ▁land ward ▁def ences ▁had ▁an ▁ang led ▁red an ▁project ing ▁from ▁the ▁centre ▁of ▁the ▁front , ▁a ▁deep ▁d itch ▁and ▁a ▁medieval ▁wall . ▁Prim itive ▁cap on iers ▁protect ▁the ▁d itch , ▁and ▁each ▁counter sc arp ▁gallery ▁had ▁a ▁s ally ▁port ▁so ▁that ▁the ▁g arrison ▁could ▁enter ▁the ▁d itch ▁without ▁being ▁seen . ▁ ▁A ▁nearby ▁hill , ▁Wind mill ▁Hill , ▁would ▁offer ▁a ▁perfect ▁site ▁to ▁bomb ard ▁the ▁fort . ▁Rec ogn ising ▁this , ▁the ▁English ▁raised ▁the ▁east ▁wall ▁in ▁ 1 6