▁ ▁U - 3 8 ▁There ▁were ▁two ▁naval ▁batt les ▁of ▁Nar vik ▁on ▁ 1 0 ▁April ▁ 1 9 4 0 ▁and ▁ 1 3 ▁April ▁ 1 9 4 0 . ▁ ▁and ▁ ▁were ▁position ed ▁at ▁the ▁entrance ▁of ▁the ▁f j ord . ▁When ▁the ▁Royal ▁Navy ▁arrived , ▁U - 3 8 ▁fired ▁at ▁ ▁and ▁at ▁ ▁missing ▁both . ▁In ▁the ▁second ▁battle , ▁U - 3 8 ▁fired ▁at ▁ ▁but ▁the ▁tor ped o es ▁det on ated ▁prem ature ly . ▁ ▁U - 4 7 ▁U - 4 7 ▁under ▁Gün ther ▁Pri en ▁encountered ▁" a ▁wall ▁of ▁ships " ▁on ▁ 1 5 ▁April . ▁A ▁British ▁fleet ▁of ▁cru is ers ▁and ▁transport ▁ships ▁were ▁anch ored ▁near ▁Nar vik ▁off loading ▁troops ▁and ▁war ▁materials . ▁Pri en ▁target ed ▁two ▁cru is ers ▁and ▁two ▁trans ports ▁with ▁the ▁four ▁forward ▁tor ped o es ▁but ▁none ▁det on ated . ▁An ▁hour ▁and ▁a ▁half ▁later ▁after ▁a ▁thorough ▁ins pection ▁of ▁the ▁tub es ▁and ▁tor ped o es , ▁Pri en ▁tried ▁again . ▁Again , ▁with ▁a ▁text book ▁sur fac ed ▁attack ▁from ▁ 7 5 0 m ▁away ▁using ▁four ▁tor ped o es ▁U - 4 7 ▁had ▁no ▁success . ▁One ▁det on ated ▁under water ▁after ▁hitting ▁a ▁rock , ▁well ▁off ▁course . ▁ ▁After ▁leaving ▁Of ot f j ord , ▁U -