Great, informative and unbiased video once again from Military History Visualized! Operation Weserübung was the German Invasion of Norway and Denmark in April 1940. It involved troops from the Army, Kriegsmarine and Luftwaffe. It involved the ships Scharnhorst, Gneisenau, Blücher, Lützow, Admiral Hipper on the German side and HMS Glowworm, Warspite and Glorious on the British. Although it was an operational success, strategically it wasn't.
The German invasion was, ostensibly, as a preventive manoeuvre against a planned, and openly discussed, Franco-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 Franco-British aggression. Significant differences in geography, location and climate between the two countries made the actual military operations very dissimilar.