2 ▁Lanc aster s ▁and ▁one ▁Mos qu ito ▁of ▁N os ▁ 9 ▁and ▁ 6 1 7 ▁Squad rons ▁attacked ▁U - bo at ▁pens ▁and ▁sh ipping ▁in ▁Ber gen ▁har bour . ▁Three ▁Lanc aster s ▁of ▁ 6 1 7 ▁Squadron ▁and ▁one ▁from ▁ 9 ▁Squadron ▁were ▁lost ; ▁the ▁Germ ans ▁told ▁the ▁local ▁people ▁that ▁ 1 1 ▁bom bers ▁had ▁been ▁shot ▁down . ▁A ▁local ▁report ▁said ▁that ▁three ▁T all bo ys ▁pen etr ated ▁the ▁ 3 ½ - met re - thick ▁roof ▁of ▁the ▁pens ▁and ▁caused ▁severe ▁damage ▁to ▁work sh ops , ▁offices ▁and ▁stores ▁inside ". ▁▁ 3 ▁February ▁ 1 9 4 5 ▁– ▁I J mu iden ▁& ▁Po orter sh aven ▁ 3 6 ▁Lanc aster s ▁of ▁No ▁ 5 ▁Group ▁attacked ▁U - bo at ▁pens ▁at ▁I J mu iden ▁( 9 ▁Squadron ) ▁and ▁Po orter sh aven ▁( 6 1 7 ▁Squadron ) ▁with ▁T all bo ys . ▁H its ▁were ▁claimed ▁on ▁both ▁targets ▁without ▁loss . ▁▁▁ 9 ▁April ▁ 1 9 4 5 ▁– ▁Hamburg ▁ 6 1 7 ▁Squadron ▁attacked ▁with ▁T all bo ys ▁and ▁Grand ▁Sl ams . ▁Some ▁of ▁the ▁bomb s ▁hit ▁their ▁target ▁and ▁no ▁aircraft ▁were ▁lost . ▁▁ 1 8 ▁April ▁ 1 9 4 5 ▁ ▁– ▁Hel ig ol and ▁ 9 6 9 ▁aircraft : ▁ 6 1 7 ▁Lanc aster s ,