 On 13 December 1939 she rescued a survivor from the British steamer , which had been torpedoed and sunk by the German U-boat .The Norwegian patrol boat rescued a further four survivors from the sunken steamer's 36-man crew.When Nazi Germany invaded Norway on 9 April 1940, initiating the 62-day Norwegian Campaign, "Nordnorge" was in dry dock undergoing the final day of her annual maintenance work.