▁I J mu iden ▁on ▁the ▁Dutch ▁coast ▁where ▁they ▁were ▁better ▁protected ▁but ▁less ▁able ▁to ▁inter f ere ▁with ▁Al lied ▁naval ▁traffic ▁supporting ▁the ▁Norm andy ▁invasion . ▁▁ 5 ▁August ▁ 1 9 4 4 ▁– ▁Br est ▁ 1 5 ▁Lanc aster s ▁of ▁ 6 1 7 ▁Squadron ▁attacked ▁the ▁U - bo at ▁pens ▁at ▁Br est ▁and ▁scored ▁six ▁direct ▁hits ▁with ▁T all bo ys ▁pen etr ating ▁the ▁concrete ▁roof s . ▁One ▁Lanc aster ▁was ▁shot ▁down ▁by ▁fla k . ▁Sub sequ ent ▁attempts ▁to ▁rein force ▁other ▁sites ▁with ▁even ▁th icker ▁concrete ▁di vert ed ▁resources ▁from ▁other ▁projects . ▁▁ 6 ▁August ▁ 1 9 4 4 ▁– ▁Ker oman ▁Fl ight ▁Lieutenant ▁Thomas ▁Cl iff ord ▁I ves on ▁dropped ▁one ▁T all boy , ▁bomb ▁failed ▁to ▁pen et rate ▁base . ▁▁ 7 ▁August ▁ 1 9 4 4 ▁– ▁Lor ient ▁The ▁planned ▁T all boy ▁mission ▁against ▁the ▁U - bo at ▁pens ▁was ▁cancel led , ▁Instead ▁Ker oman ▁Sub marine ▁Base ▁was ▁the ▁primary ▁target . ▁▁ 8 ▁August ▁ 1 9 4 4 ▁– ▁La ▁P all ice ▁Fl ight ▁Lieutenant ▁Thomas ▁Cl iff ord ▁I ves on ▁dropped ▁one ▁T all boy . ▁▁ 2 8 ▁August ▁ 1 9 4 4 ▁– ▁I J mu iden ▁Fl ight ▁Lieutenant ▁Thomas ▁Cl iff ord ▁I ves on ▁dropped ▁one ▁T all boy . ▁ ▁September ▁– ▁November ▁ 1