Operation Weserübung

1940 German invasion of Denmark and Norway in WWII

Operation Weserübung (Unternehmen Weserübung [ˈveːzɐˌʔyːbʊŋ], (German: "Operation Weser Exercise") was the invasion of Denmark and Norway by Nazi Germany during World War II. Taking place from 9 April – 10 June 1940, it was the opening operation of the Norwegian Campaign. In the early morning of 9 April 1940 (Wesertag, "Weser Day"), German forces occupied Denmark and invaded Norway, ostensibly as a preventive manoeuvre against a planned Anglo-French occupation of Norway known as Plan R 4, which developed as a response to a German invasion of Norwegian territory. After the rapid occupation of Denmark, in which the Danish military was ordered to stand down as Denmark's government did not declare war with Germany, German envoys informed the governments of Denmark and Norway that Germany's forces had come to protect both countries against Anglo-French attacks.

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