Operation Weserübung in the context of "United Kingdom in World War II"

Norway, officially the Kingdom of Norway, is a Nordic country located on the Scandinavian Peninsula in Northern Europe. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of the Kingdom of Norway. Bouvet Island, located in the Subantarctic, is a dependency, and not a part of the Kingdom; Norway also claims the Antarctic territories of Peter I Island and Queen Maud Land. Norway has a population of 5.6 million. Its capital and largest city is Oslo. The country has a total area of 385,207 square kilometres (148,729 sq mi). The country shares a long eastern border with Sweden, and is bordered by Finland and Russia to the northeast. Norway has an extensive coastline facing the Skagerrak strait, the North Atlantic Ocean, and the Barents Sea. In 2024, Norway was ranked the seventh happiest country in the world.

The unified kingdom of Norway was established in 872 as a merger of petty kingdoms and has existed continuously for 1,152–1,153 years. From 1537 to 1814, Norway was part of Denmark–Norway, and, from 1814 to 1905, it was in a personal union with Sweden. Norway was neutral during the First World War, and in the Second World War until April 1940 when it was invaded and occupied by Nazi Germany until the end of the war.

The occupation of Norway by Nazi Germany during the Second World War began on 9 April 1940 after Operation Weserübung. Conventional armed resistance to the German invasion ended on 10 June 1940, and Nazi Germany controlled Norway until the capitulation of German forces in Europe on 8 May 1945. Throughout this period, a pro-German government named Den nasjonale regjering ('the National Government') ruled Norway, while the Norwegian king Haakon VII and the prewar government escaped to London, where they formed a government in exile. Civil rule was effectively assumed by the Reichskommissariat Norwegen (Reich Commissariat of Norway), which acted in collaboration with the pro-German puppet government. This period of military occupation is, in Norway, referred to as the "war years", "occupation period" or simply "the war".

The Norwegian resistance (Norwegian: Motstandsbevegelsen) to the occupation of Norway by Nazi Germany began after Operation Weserübung in 1940 and ended in 1945. It took several forms:

• Asserting the legitimacy of the exiled government, and by implication the lack of legitimacy of Vidkun Quisling's pro-Nazi regime and Josef Terboven's military administration
• The initial defence in Southern Norway, which was largely disorganised, but succeeded in allowing the government to escape capture
• The more organised military defence and counter-attacks in parts of Western and Northern Norway, aimed at securing strategic positions and the evacuation of the government
• Armed resistance, in the form of sabotage, commando raids, assassinations and other special operations during the occupation
• Civil disobedience and unarmed resistance

Plan R 4 was an unrealised British plan to invade Norway and Sweden in April 1940, during the Second World War. As a result of competing plans for Norway and Operation Weserübung, the German invasion of Norway the same month, it was not carried out as designed. Similar plans had been made for the proposed Anglo-French intervention in the Winter War.

The Interim Peace (Finnish: Välirauha, Swedish: Mellanfreden) was a short period in the history of Finland during the Second World War. The term is used for the time between the Winter War and the Continuation War, lasting a little over 15 months, from 13 March 1940 to 24 June 1941. The Moscow Peace Treaty was signed by Finland and the Soviet Union on 12 March 1940 and it ended the 105-day Winter War.

In the aftermath of the Winter War, both the Soviet Union and Finland were preparing for a new war while Stalin pressured the Finns politically. In early 1940 Finland sued for an alliance with Sweden but both the Soviet Union and Nazi Germany opposed it. Nazi Germany occupied Denmark and Norway in April 1940 and defeated France in June 1940. Then, Stalin occupied the Baltic states. In 1941, Finland negotiated its participation in the Axis invasion of the Soviet Union.

The German invasion of Denmark (German: Operation Weserübung – Süd), was the German attack on Denmark on 9 April 1940, during the Second World War. The attack was a prelude to the invasion of Norway (German: Weserübung Nord, 9 April – 10 June 1940).

Denmark's strategic importance for Germany was limited. The invasion's primary purpose was to use Denmark as a staging ground for operations against Norway, and to secure supply lines to the forces about to be deployed there. An extensive network of radar systems was built in Denmark to detect British bombers bound for Germany.

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 occupied Denmark in Operation Weserübung. The Danish government and king functioned in a relatively normal manner until 29 August 1943, when Germany placed Denmark under direct military occupation, which lasted until the Allied victory on 5 May 1945. Contrary 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 remained in the country in an uneasy relationship between a democratic and a totalitarian system until 1943 when the Danish government stepped down in protest against German demands that included instituting the death penalty for sabotage.

Just over 3,105 Danes died as a direct result of the occupation. A further 2,000 volunteers of Free Corps Denmark and Waffen-SS, most of whom originated from the German minority of southern Denmark, died fighting on the Eastern Front, while 1,072 merchant sailors died in Allied service. Overall, this represents a very low mortality rate compared to other occupied countries and most belligerent countries. In addition to the volunteers of Free Corps Denmark and Waffen-SS, some Danes chose to collaborate during the occupation by joining the National Socialist Workers' Party of Denmark, Schalburg Corps, HIPO Corps and Peter Group (often with considerable overlap between the participants of the different groups). The National Socialist Workers' Party of Denmark participated in the 1943 Danish Folketing election, but despite significant support from Germany it only received 2.1% of the votes. In Denmark, the occupation period is known as Besættelsen (Danish for "the Occupation").