The war in Europe began in September 1939, when Germany, under Chancellor Adolf Hitler, invaded Poland. Britain and France responded by declaring war on Germany but took little action over the following months. In 1940, Germany launched its next initiative by attacking Denmark and Norway, followed shortly thereafter by attacks on Belgium, The Netherlands, and France. All of these nations were conquered rapidly. & now there is the question why rapidly how can be Germans are able to conquer & deep penetrate into the heart of the Europe.
1. defeat in ww1 & rebuild the moral & strategy & revenge of Germany as nation.
2.dedication & political wave of their Nazi regime & their thoughts that we are the most superior & intelligent & most advance nation in this world. we deserve the whole not just parts. ( & yes no doubt on that time Germany have most advance technologies & principals & mechanism about all areas.
3. lack of visionary & friendly leadership inside of Germany & lack of individual German interaction to the outside world.
with these factors Nazi Germany thought that Germany is unbeatable & unstoppable. In early stage of war they prove that with their blitzkrieg war doctrine & their state of the art weapon-technology such as "Gustav".
( i will soon post separately about Gustav) & jet engine technology v1 & v2 rockets & their tactics of battles.
