, ▁a ▁heavily ▁fort ified ▁V - 2 ▁launch ▁site ▁under ▁construction ▁The ▁b unker ▁was ▁rendered ▁useless . ▁▁ 2 4 ▁June ▁ 1 9 4 4 ▁ ▁– ▁W iz ern es ▁The ▁target ▁was ▁a ▁V - 2 ▁assembly ▁and ▁launch ▁site ▁linked ▁with ▁the ▁W atten ▁site . ▁Several ▁T all boy ▁hits ▁und erm ined ▁the ▁found ations ▁but ▁did ▁not ▁pen et rate ▁the ▁d ome . ▁The ▁b unker ▁was ▁abandoned . ▁▁ 2 5 ▁June ▁ 1 9 4 4 ▁– ▁Si rac ourt ▁V - 1 ▁b unker ▁Lanc aster s ▁of ▁ 6 1 7 ▁Squadron ▁scored ▁three ▁direct ▁hits ▁with ▁T all bo ys ▁without ▁loss . ▁▁ 4 ▁July ▁ 1 9 4 4 ▁– ▁Saint - Le u - d ' Es ser ent ▁ 6 1 7 ▁Squadron ▁used ▁sevent een ▁Lanc aster s ▁with ▁T all bo ys , ▁supported ▁by ▁one ▁Mos qu ito ▁and ▁one ▁Must ang , ▁in ▁an ▁attempt ▁to ▁collapse ▁the ▁lim estone ▁roof ▁of ▁the ▁c aves ▁used ▁as ▁storage ▁dep ots . ▁A ircraft ▁from ▁No ▁ 5 ▁Group ▁followed ▁up ▁with ▁ ▁bomb s . ▁▁ 6 ▁July ▁ 1 9 4 4 ▁– ▁M imo y ec ques ▁ ▁Att ack ▁on ▁V - we ap on ▁targets . ▁Dam age ▁was ▁unknown ▁at ▁the ▁time , ▁and ▁efforts ▁continued . ▁In ▁September , ▁al lied ▁ground ▁forces ▁found ▁gall eries ▁blocked ▁with ▁earth ▁and ▁de br is ▁where