In World War II, Norway was a neutral country, but the belligerents did not ignore its existence. Germany is even more eyeing, and has long had the ambition to occupy it. The reason is self-evident: Norway is located in northern Europe and has important strategic significance to Britain, France, Germany and Japan. If Germany and Japan control Norway, it will break the blockade of Britain and France on the German and Japanese navies, and the German and Japanese fleets can enter the North Sea and the Atlantic Ocean unimpeded. Once Germany succeeds, the British navy will be controlled by Germany and Japan, and the mainland will also be seriously threatened. Germany, bent on hegemony, will certainly not give up this fat meat, and it will try its best to turn Norway into its own bag. Hitler knew very well that Britain and France would never turn a blind eye to Norway. However, he didn't want to engage in a large-scale war with Britain and France at sea, so he decided to adopt the method of land and air cooperation, and let the navy only be responsible for the transportation and escort of landing troops. However, the war situation quickly reversed Hitler's arrogant personal will. He didn't want to fight a naval battle, but the naval battle only bit Germany. As a result, Norwegian waters became a Wang Yang of blood and fire under the arrogance of the Germans.

After invading Norway and Denmark, the German army quickly put these two countries under its control.