France launches a major offensive in September 1939, Poland is fully mobolized

While the scenario will obviously deviate from OTL, I think that Poland still gets crushed, France still falls and Russia still enter the war.

I think that this isn't necessarily so. The Battle of France was a very chancy thing OTL, even with all the advantages the Nazis had, no to mention several lucky breaks. Granted, I don't see a better Polish mobilization affecting much the result, and it's possible that if nothing else deviates past the slightly harder Battle of Poland that the only result is a harder Battle of France. What I'm really questioning is whether if such happens, the Battle of France will unfold in the same way.
 
Poland fully mobilized means that France and Britain put less pression on Poles to appease Hitler (they forced Poland to call of full mobilization in August 1939 IOTL), so the West is psychologically more prepared to deal with Germany by force, if necessary. French agreement to Polish full mobilization might also mean earlier mobilization of the French Army (not necessarily full mobilization). That might mean, that on September the 1st Germany receives ultimatum to get the hell out of Poland in 24 hours and then declaration of war on September 2nd. It doesn't change much.
Fully mobilized Poles might prove somewhat bigger problem for Wehrmacht than IOTL. E.g. Poles might keep line of Narew river, Intervention Corps might be withdrawn earlier from the corridor, which strenghtens Polish reserves, etc. German losses are higher and their progress slower, generally, however, I think Poland was pretty much lost anyway. But tougher Polish resistance means that German can not send any reinforcements to the western front.
AFAIK in 1939-1940 the French Army fully believed in defense as winning strategy. They were not big fans of offensive actions, which is somewhat understandable considering the massacre of WW1. But more bellicose French might decide it is better to hit Germans in their back, while core of their army is busy with Poland - a shot pain to spare long illness. IIRC the French had quite good artillery, a useful thing to deal with fortifications, especially since Siegfried Line was far from being finished and German forces there were seconfd or third rate anyway. I think French chances of breaking it might be not so low as many people believe.
There is also a psychological factor. Hiler and his cronies were schocked after British and French declaration of War. The German population was not so happy either. They got over it, since France and Britain didn't seem to do anything, but with the French much more active and at least to some degree successful, a hit to German morale might be much stronger.
Would it make German generals try to overthrow Hitler? Hard to say, I have my doubts. But with active west, Stalin might decide to remain passive, and that means Germans have to occupy whole Poland - another drain on people and resources. If the French break the Siegfried Line and reach the Rhine (perhaps even cross it), Germany might be in real trouble.
 
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