4 7 ▁sp otted ▁and ▁attacked ▁HMS ▁War sp ite . ▁One ▁tor ped o ▁det on ated ▁ahead ▁of ▁the ▁batt les hip , ▁while ▁another ▁det on ated ▁far ▁behind . ▁U - 4 7 ▁spent ▁the ▁next ▁hours ▁sub mer ged ▁under ▁persistent ▁depth ▁charge ▁attack . ▁ ▁U - 4 8 ▁U - 4 8 ▁under ▁Herbert ▁Sch ult ze ▁made ▁multiple ▁attacks ▁on ▁a ▁fleet ▁of ▁three ▁cru is ers ▁on ▁ 1 0 ▁April , ▁but ▁the ▁tor ped o es ▁failed ▁to ▁arm ▁or ▁det on ated ▁prem ature ly . ▁Later ▁on ▁ 1 4 ▁April , ▁U - 4 8 ▁attacked ▁HMS ▁War sp ite ▁but ▁both ▁tor ped o es ▁failed ▁to ▁det on ate . ▁War sp ites ▁destroy er ▁screen ▁fired ▁on ▁the ▁vessel ▁and ▁U - 4 8 ▁was ▁depth ▁charged , ▁but ▁escaped ▁destruction . ▁ ▁U - 5 1 ▁U - 5 1 ▁attacked ▁a ▁destroy er , ▁but ▁the ▁tor ped o es ▁det on ated ▁prem ature ly . ▁On ▁ 1 9 ▁April , ▁commander ▁Diet rich ▁Kn orr ▁attacked ▁the ▁French ▁cru iser ▁É mile ▁Bert in , ▁but ▁both ▁tor ped o es ▁missed . ▁ ▁U - 6 5 ▁Hans - G er rit ▁von ▁Stock hausen ▁command ing ▁U - 6 5 ▁attacked ▁a ▁group ▁of ▁British ▁destroy ers , ▁but ▁the ▁tor ped o es ▁missed ▁or ▁failed ▁to ▁arm . ▁The ▁U - bo at ▁subsequently ▁suffered ▁moder ate