 There were two naval battles of Narvik on 10 and 13 April 1940 . U @-@ 38 and U @-@ 65 were positioned at the entrance to the fjord . When the Royal Navy arrived , U @-@ 38 fired at HMS Valiant and at HMS Southampton missing both . In the second battle , U @-@ 38 fired at Effingham , but the torpedoes malfunctioned , ( exploding prematurely ) . 
