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Hope I translated the thread title correctly.
As a thought exercise or study; what could the Poles do from 1 August 1939 to create the optimal defense of Poland. that is with the object of dragging out the campaign the longest possible time & inflict the maximum cost on the invaders? these can only be actions possible after a PoD of 1 August. This assumes the Poles have solid intelligence of German intentions and are not trying to guess how the threats of August will play out.
One obvious action would be complete mobilization of the reservists, adding perhaps eight more divisions and support units to the field forces. Another might be abandoning the perimeter or cordon defense for a more concentrated defense of Warsaw and a few other major cities.
What about premeptive strikes? Any possibilities there?