The Norwegian operation was a military operation of Nazi Germany against the Norwegian Kingdom, beginning on April 9, 1940, and lasting until June 8....
Anschluss was the annexation of Austria into Germany, on March 12-13, 1938. The independence of Austria was restored in April 1945, after its occupation...
In the Medieval period, every kingdom was at war, everyone was fighting against everyone and it was just a mess.
As technology developed a lot of things changed.