Most historians agree that the Blitzkrieg covered the period 1939-1941 of WW II.

On 1st September 1939, Germany attacked Poland with a blitzkrieg (lightning strike) and this action started Word War II.

The Germans used Blitzkrieg in World War II to capture Austria and Czechoslovakia and later Poland, by taking these countries by surprise and in a very quick manner.

Robotech - 1985 Blitzkrieg 1-6 was released on:

USA: 1985

In WW II, the German method of attack was called the blitzkrieg.