▁English ▁Channel ▁coast ▁to ▁target ▁British ▁sh ipping ▁in ▁the ▁Channel , ▁but ▁proved ▁un success ful ▁at ▁this ▁task . ▁ ▁Two ▁K 5 ▁guns , ▁named ▁" Ro bert " ▁and ▁" Le op old " ▁by ▁German ▁cre ws , ▁were ▁sh ipped ▁to ▁Italy ▁to ▁help ▁counter ▁the ▁American ▁landing ▁at ▁the ▁town ▁of ▁An z io ▁in ▁February ▁ 1 9 4 4 . ▁The ▁Al lied ▁soldiers ▁stuck ▁on ▁the ▁beach ▁nick named ▁the ▁two ▁German ▁guns ▁" An z io ▁An nie " ▁and ▁" An z io ▁Express " ▁due ▁to ▁the ▁express ▁train - like ▁sound ▁the ▁shell s ▁generated . ▁On ▁ 1 8 ▁May ▁ 1 9 4 4 ▁the ▁guns ▁fired ▁off ▁their ▁remaining ▁am mun ition ▁and ▁then ▁escaped ▁along ▁the ▁coast al ▁rail road ▁into ▁the ▁rail ▁yard ▁in ▁C iv it ave c chia , ▁in ▁prepar ation ▁for ▁ev acu ation . ▁This ▁proved ▁impossible ▁and ▁the ▁guns ▁were ▁destroyed ▁by ▁their ▁cre ws . ▁ ▁Tow ards ▁the ▁end ▁of ▁the ▁war , ▁development ▁was ▁done ▁to ▁allow ▁the ▁K 5 ▁to ▁fire ▁ro cket - ass isted ▁project iles ▁to ▁increase ▁range . ▁Success ful ▁implementation ▁was ▁done ▁for ▁firing ▁these ▁from ▁the ▁K 5 V z . ▁ ▁A ▁final ▁experiment ▁was ▁to ▁bore ▁out ▁two ▁of ▁the ▁weapons ▁to ▁ ▁smooth b ore ▁to ▁allow ▁firing ▁of ▁the ▁Pe en em ünd er ▁P fe il gesch os se ▁arrow ▁shell s .