Campaña de Noruega
Nazi Germany's war industry's dependence on Swedish iron ore shipments was the primary reason for Great Britain and their allies to launch their Operation Wilfred and the Norwegian Campaign in early April 1940. By early June 1940 the Norwegian Campaign stood as a failure for the allies, and by securing access to Norwegian ports by force, Nazi Germany could obtain the Swedish iron ore supply it needed for war production despite the British naval blockade.