Denmark in World War II: German authorities demand that Danish authorities crack down on acts of resistance. The next day, martial law is imposed on Denmark.

At the outset of World War II in September 1939, Denmark declared itself neutral, but that neutrality did not prevent Nazi Germany from occupying the country soon after the outbreak of war; the occupation lasted until Germany's defeat. The decision to occupy Denmark was taken in Berlin on 17 December 1939. On 9 April 1940, Germany invaded Denmark in Operation Weserübung. In contrast to the situation in other countries under German occupation, most Danish institutions continued to function relatively normally until 1945. Both the Danish government and King of Denmark remained in the country in an uneasy coalition between a democratic system and a totalitarian one until, amidst growing civilian resistance and unrest, the Danish government refused to further cooperate with the Germans' demands; in response, on 29 August 1943, Germany declared martial law and placed Denmark under direct military occupation, which lasted until the Allied victory on 5 May 1945.