Because most other Europeans were using outdated defensive tactics
Because the military leadership of other nations were mired in lessons learned from the previous major war, as always. Those lessons were, hunker down in an impregnable fortress and let the enemy beat their heads against it. So the Nazis simply went around them. easy.
the blitzkrieg
Because it was so quick
Blitzkrieg
Poland 1939
In German, blitz means lightning and krieg means war. So the German concept of a blitzkrieg was to invade a certain country quickly, with overwhelming force, before a defense could be mounted.
Because most other Europeans were using outdated defensive tactics
In German, Blitzkrieg means lightning war (Blitz-Krieg). Blitzkrieg was named so because it included surprise attacks etc
the blitzkrieg
Because it was so quick
Blitzkrieg
Blitzkrieg was so affective because the Germans sent in, virtually, everything at once. Going at a fast past overwhelming the enemy with speed and firepower. Infantry, and Tanks would rush in while shooting and force the enemy to fall back while having cover from the German Airforce, or Luftwaffe. Forcing the enemy to fall back or be overrun.
Germans used the strategy known as blitzkrieg (As I recall it's german for lightning war), which was highly effective. Blitzkrieg is a highly mobile form of infantry and armour working together in combined arms teams and was heavily supported with close air support.
The term blitz (meaning lightning), from the term Blitzkrieg (meaning lightning war).
Mechanized infantry allowed soldiers and small artillery pieces to be transported quickly along far distances. One of the reasons the German blitzkrieg was so effective.
German used blitzkrieg tactics on Poland during the lightning war.
Lightning war in German. Blitzkrieg
In WWII it was the blitzkrieg.