In the early morning of 9 April 1940, Germany invaded Denmark and Norway, ostensibly as a preventive manoeuvre against a planned, and openly discussed, British occupation of Norway. After the invasions, envoys of the Germans informed the governments of Denmark and Norway that the Wehrmacht had come to protect the countries' neutrality against possible future British aggression.
Strategically, Denmark's importance to Germany was as a staging area for operations in Norway, and of course as a border nation to Germany which would have to be controlled in some way. Given Denmark's position in relation to the Baltic Sea the country was also important for the control of naval and shipping access to major German and Soviet harbours. Small and relatively flat, the country was ideal territory for German army operations, and Denmark's small army had little hope. Nevertheless, in the early morning hours, a few Danish troops engaged the German army. Combined operation from sea and on the land resulted in swift capture of the entire Denmark!
Norway was important to Germany for two primary reasons: as a base for naval units, including U-boats, to harass Allied shipping in the North Atlantic, and to secure shipments of iron-ore from Sweden (we are trading 2 Irons from Sweden currently

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The important western city of Stavanger was captured by the Germans on 9 April, after heavy bombardement by German Navy. Some 2,000 German soldiers occupied Stavanger and captured the Norwegian arms depots there. The small Norwegian infantry forces in Stavanger (represented by Partisans) retreated eastwards, blowing up two railway bridges and sections of road after them. Despite the loss of the city, the regional Norwegian commander, General William Steffens, ordered a total mobilization. During mid-April the 6,000-strong Norwegian 4th Division, responsible for the defence of Western Norway, was mobilized around the Bergen. The 4th Division was the only military district outside of Northern Norway to be mobilized completely and in an orderly fashion.
The German cruiser Admiral Hipper landing troops in Trondheim Stavanger.