0 s ▁and ▁are ▁built ▁from ▁brick ▁and ▁stone . ▁They ▁had ▁a ▁lines ▁of ▁gun ▁positions , ▁each ▁designed ▁to ▁hold ▁a ▁heavy ▁gun ▁and ▁a ▁crew ▁of ▁up ▁to ▁ 1 2 ▁men . ▁The ▁positions ▁were ▁protected ▁by ▁gran ite - front ed ▁cas em ates ▁and ▁wr ought - ir on ▁shield s , ▁and , ▁with ▁remov able ▁window ▁screens , ▁double d ▁as ▁living ▁accommod ation ▁for ▁the ▁cre ws . ▁Small ▁mag az ines ▁were ▁position ed ▁behind ▁the ▁lines ▁of ▁cas em ates . ▁ ▁The ▁West ▁Wing ▁is ▁approximately ▁ ▁long , ▁and ▁has ▁ 3 7 ▁heavy ▁gun ▁positions ▁and ▁two ▁main ▁mag az ines , ▁along ▁with ▁various ▁auxili ary ▁buildings , ▁including ▁can te ens , ▁stores ▁and ▁det ention ▁facilities . ▁It ▁also ▁has ▁two ▁of ▁the ▁castle ' s ▁l ighth ouses , ▁an ▁ 1 8 6 5 ▁tower , ▁now ▁dis used , ▁and ▁an ▁iron , ▁gas - lit ▁tower , ▁still ▁in ▁use . ▁The ▁garden ▁is ▁a ▁recre ation ▁of ▁the ▁garden ▁in ▁the ▁Second ▁World ▁War . ▁The ▁late - 1 9 th ▁century ▁and ▁early - 2 0 th ▁guns ▁at ▁the ▁castle ▁were ▁pre domin antly ▁added ▁to ▁the ▁West ▁Wing , ▁and ▁it ▁roof ▁supports ▁emp lac ements ▁for ▁ 1 2 - ▁and ▁ 6 - p ound er ▁( 5 . 4 ▁and ▁ 2 . 7   kg ) ▁quick - f iring ▁guns , ▁a ▁B