2 nd ▁pat rol ▁The ▁boat ' s ▁second ▁for ay ▁was ▁to ▁the ▁mid - At l antic . ▁She ▁s ank ▁Cou lt arn ▁south west ▁of ▁I cel and ▁on ▁ 3 0 ▁March . ▁She ▁then ▁attacked ▁and ▁dam aged ▁Th irl by , ▁which ▁had ▁been ▁en ▁route ▁from ▁St . ▁Joh ns , ▁New found land ▁to ▁H ull . ▁The ▁ship ▁had ▁also ▁probably ▁been ▁hit ▁by ▁a ▁tor ped o ▁fired ▁by ▁. ▁This ▁weapon ▁was ▁a ▁d ud . ▁( The ▁ship ▁was ▁further ▁dam aged ▁by ▁a ▁bomb ▁from ▁a ▁German ▁aircraft ▁on ▁ 1 0 ▁April ). ▁ ▁U - 6 9 ▁returned ▁to ▁Lor ient ▁on ▁ 1 1 ▁April . ▁▁ 3 rd ▁pat rol ▁The ▁boat ' s ▁next ▁sortie ▁was ▁to ▁the ▁West ▁African ▁coast . ▁She ▁laid ▁mines ▁off ▁Lag os ▁and ▁Tak or adi ▁and ▁made ▁full ▁use ▁of ▁the ▁failure ▁of ▁the ▁al lies ▁to ▁en force ▁con voy ▁systems . ▁ ▁One ▁of ▁her ▁vict ims ▁was ▁the ▁neutral ▁American ▁ship ▁ ▁operating ▁ 7 5 0 ▁miles ▁off ▁the ▁British ▁port ▁of ▁Fre et own , ▁Sierra ▁Le one . ▁The ▁s inking ▁of ▁Robin ▁Mo or ▁caused ▁President ▁Ro ose vel t ▁to ▁brand ▁Germany ▁an ▁" intern ational ▁out law " ▁and ▁to ▁require ▁Germany ▁and ▁Italy ▁to ▁close ▁all ▁of ▁their ▁cons ul ates ▁in ▁the ▁United ▁States ▁except ▁for ▁their ▁emb ass ies . ▁Before ▁the ▁s inking ,