▁boat ▁became ▁oper ational ▁on ▁ 1 ▁April ▁ 1 9 4 3 ▁when ▁she ▁was ▁transferred ▁to ▁the ▁ 6 th ▁fl ot illa . ▁▁ 1 st ▁and ▁ 2 nd ▁pat rol s ▁U - 2 7 0 s ▁first ▁pat rol ▁began ▁when ▁she ▁depart ed ▁K iel ▁on ▁ 2 3 ▁March ▁ 1 9 4 3 . ▁She ▁entered ▁the ▁Atlantic ▁Ocean ▁after ▁negoti ating ▁the ▁gap ▁between ▁I cel and ▁and ▁the ▁Far oe ▁Islands . ▁Two ▁crew ▁members ▁were ▁injured ▁in ▁bad ▁weather ▁on ▁ 4 ▁April . ▁She ▁then ▁dock ed ▁at ▁the ▁French ▁Atlantic ▁port ▁of ▁St . ▁Naz aire ▁on ▁ 1 5 ▁May . ▁ ▁For ▁her ▁second ▁sortie , ▁the ▁boat ▁moved ▁through ▁the ▁Atlantic ▁waters ▁off ▁north west ▁Spain . ▁▁ 3 rd ▁and ▁ 4 th ▁pat rol s ▁She ▁attacked ▁the ▁British ▁fr ig ate ▁ ▁which ▁caused ▁the ▁war ship ▁to ▁be ▁declared ▁a ▁total ▁loss . ▁During ▁an ▁attack ▁on ▁a ▁con voy ▁in ▁mid - At l antic , ▁the ▁boat ' s ▁pressure ▁h ull ▁was ▁crack ed ▁by ▁depth ▁charges ▁dropped ▁by ▁the ▁esc ort s ; ▁the ▁sub marine ▁was ▁forced ▁to ▁return ▁to ▁base . ▁ ▁U - 2 7 0 ▁was ▁attacked ▁by ▁a ▁British ▁B - 1 7 ▁F lying ▁Fort ress ▁on ▁ 6 ▁January ▁ 1 9 4 4 ▁and ▁succeeded ▁in ▁shooting ▁the ▁aircraft ▁down , ▁but ▁not ▁before ▁sufficient ▁damage ▁was ▁caused ▁to ▁force