wk:-
Why the Polish government did not accept Germany's generous compensation for letting the Danzig corridor go (re-uniting East Prussia with the rest of Germany) is hard to understand
Perhaps it was that they were rather better informed! Rather like the Belgians they knew that the threat was always from the West or from the East, or as it turned out this time from both and simultaneously! They had been after all breaking the Enigma traffic, were no doubt avid readers of Mein Kampf, and knew where he was going and how he was going to get there.
I've no doubt also that they knew they possessed the one vital raw materiel desperately needed by Germany, the Gold reserves. Those wily Swiss bankers were not impressed by the creative accountancy of the Reich Bank, that had bankrolled the Wehrmacht and the Autobahns, and demanded Gold on the Nail in exchange for the Foreign Exchange that was needed to balance the books. Hitler had to go to war, and the Poles knew it long before the Germans did.