▁War , ▁the ▁Home ▁Guard ▁used ▁Fort ▁Clar ence ▁as ▁headquarters ▁and , ▁with ▁the ▁invasion ▁sc are , ▁the ▁fort ▁was ▁pressed ▁into ▁service ▁again . ▁▁ ▁During ▁the ▁war , ▁a ▁massive ▁under ground ▁aircraft ▁factory ▁was ▁built ▁under ▁Fort ▁Clar ence ▁for ▁use ▁by ▁Short ▁Brothers ▁who ▁had ▁their ▁main ▁factory ▁on ▁the ▁Med way ▁below ▁the ▁fort . ▁ ▁After ▁the ▁war , ▁the ▁fort ▁became ▁der el ict , ▁then ▁in ▁the ▁mid ▁ 1 9 6 0 s ▁the ▁G PO ▁( now ▁British ▁Tele com ) ▁moved ▁in , ▁demol ishing ▁all ▁the ▁bar ra cks , ▁filling ▁in ▁a ▁substantial ▁part ▁of ▁the ▁mo at ▁and ▁demol ishing ▁the ▁Ma id stone ▁Road ▁guard house . ▁▁ ▁The ▁most ▁substantial ▁remains ▁now ▁are ▁the ▁brick ▁gun ▁tower ▁and ▁section ▁of ▁d itch ▁from ▁St ▁Margaret ' s ▁Street ▁into ▁the ▁public ▁gard ens ▁opposite . ▁Below ▁the ▁gard ens ▁— ▁don ated ▁to ▁the ▁city ▁of ▁Ro chester ▁by ▁former ▁mayor ▁Charles ▁Will is ▁in ▁memory ▁of ▁a ▁son ▁killed ▁in ▁the ▁First ▁World ▁War ▁— ▁is ▁a ▁s ally ▁port ▁with ▁se aled - up ▁door . ▁This ▁connected ▁with ▁tunnel ▁that ▁led ▁to ▁the ▁gun ▁tower ▁and ▁probably ▁to ▁the ▁Med way ▁tower , ▁which ▁is ▁long ▁demol ished . ▁In tr ud ers ▁into ▁the ▁tunnel ▁system ▁would ▁have ▁been ▁gre et ed ▁by ▁fire ▁from ▁loop hol es ▁built ▁into ▁the ▁entrance ▁t unn els ▁walls . ▁The ▁present ▁status ▁of