It flatters us greatly to focus upon WWII as simply a war between good (us) and evil (them).
This, rather than accurately/painfully contrasting the high expectations of all sides in September 1939 (and many other such key dates throughout the six year conflict) with the depressing reality of September 1945.
For the swift and powerful English and German bomber fleets (or swift and powerful Russian and German tank armies) (or swift and powerful Japanese and American carrier task forces) did not 'always get through' .
No major campaign - and the war itself - ever ended in a breakthrough after a few swift painless weeks, as promised.
Super Hero militaries and their civilian fellow travellers certainly talked a lot during WWII--- but they did not walk.
Instead civilians in bomb shelters, little Grumman fighter planes, muddy infantrymen and tiny corvette navies plodded their way to a sad, slow victory : in a truly un-superheroic fashion