The British and French were not upto the job of defending against the Blitzkreig method of warfare in 1940, France and Britain lost The Battle of France because the Germans were superior at this particular time in warfare.
Blitzkreig was tried again the The Ardennes campaign later in the war, but failed because the Allies land armies and Air forces were now superior than the Axis powers.
Allies US,GB Canada, Australia etc
Axis Germany,Italy,Hungary,Rumania and Vichy France etc
We won we won we won
Ha ha ha! what happened there?
We lost the British Empire and i have just bought brand new Ford with cash