Blitzkrieg tactics were very successful, because they were surprise attacks, so the country being attacked usually didn't have time to prepare for the attack. They were also very quick, so Germany could blitzkrieg attack another country, and then leave before the country attacked could gather its military to defend themselves.
<span>A- Mutually Assured Destruction
It was the idea that if either shot off a weapon, then the other would and so on until everyone was destroyed.</span>