No, "blitskrieg" was a war strategy that Hitler used during his attack on Poland. Blitskrieg is "lightning war" in german. basicly quick relentless assault.
Poland was the first military target of the Nazi Blitskrieg or lightning war. There were jokes that Krakow! is onamopoetic for a Howitzer letting go, and of course the obvious joke that Warsaw was aplty named, seeing much battle damage.