In April 1940, Germany launched a surprise invasion of neutral Denmark and Norway.
The code used for the assault during the World War II is “Operation Weserubung”. It was in the early morning of April 9 1940 that Germany invaded Denmark and Norway as a way of a preventive manoeuvre against a planned Franco-British occupation of Norway. When the invasions were done, the Germans informed the government of Denmark and Norway that Wehrmacht had come to protect their neutralities.