PC/WI: Poland holds longer - what next?

Let's assume best case scenario (without any major changes before September 1939):
- Poland has a different battle plan which involves defending on rivers and other defensible natural formations. Mobilisation isn't delayed (OTL Allies pressured on "not angering" Hitler - mobilisation was stopped and reannouced day later).
- No Abbevile, Allies do not decide to not help at all and don't agree to any possible German attempts to pullout another Munich.
- Poland manages to holdout long enough to let French and British prepare offensive in the West. (probably until spring 1940 not further)
- Supplies arrive through Romanian ports and railways, escorted by evacuated Polish Navy (see Peking Plan)
- Germany reverts troops from Poland to West after Franco-British offensive
- Stalin doesn't decide to invade as fast as OTL, he lets capitalists and nazis bleed, takes his part when Polish Army has almost fallen.

Is this any plausible? If yes how would ATL WW2 go on? How far could WAllies advance? Would Germany eventually push Allies back and defeat France as OTL?
 

BigBlueBox

Banned
This isn’t possible at all “without any major changes before September 1939”. You would need a POD in 1938 or even earlier. Germany’s numerical and qualitative advantages are overwhelming.
 
This isn’t possible at all “without any major changes before September 1939”. You would need a POD in 1938 or even earlier. Germany’s numerical and qualitative advantages are overwhelming.
Agreed. However if you reach into infinite timelines you might find a handful where an entire German army group is encircled, or East Prussia is overrun.
 
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