DS Halden 1 ( tidligere fredrikshald 1 ) On the day of the German invasion of Norway (Apr. 9-1940) Halden 1, en route to Oslo, was on her way into the Drøbak sound and found herself between the German cruiser Blücher and Oscarsborg fortress. Her funnel and lifeboat were struck by small calibre shells and she managed to get into Drøbak.