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Poland Remembers start of WW2 [200]
And this bombardment came forth from German frustration that Dutch resistance was a bit stronger than expected, hence it took too long (4 days!) to conquer the country.
Nah...it was a misunderstanding.
The surrender came to late...the airforce was already under way.
en.wikipedia.org/wiki/Rotterdam_Blitz
...Schmidt postponed a second ultimatum to 16:20.[22][23] However, just as the Dutch negotiator was crossing the Willemsbrug to relay this information, the drone of bombers was heard...
...Student radioed to postpone the planned attack, but when the message reached KG 54's command post, the Kommodore, Oberst Walter Lackner, was already approaching Rotterdam and the aircraft had reeled-in their long-range aerials...
Wearesorry!
...Schmidt sent a conciliatory message to the Dutch commander, who surrendered shortly afterwards.[28]
I disagree...
What else...
During the France Campaign the french/british troops outnumbered the Germans in all but Airforce.
When a outnumbered attacking force runs over a bigger army and their whole country in 6 weeks you can call that either "middle finger" or the most humiliating defeat of an army ever!