WI: German Invasion of Poland at end of March 1939

I have read in The Maisky Diaries: Red Ambassador to the Court of St. James's 1932-1943, edited by Gabriel Gorodetsky, that on the afternoon of 29 March 1939 the British foreign secretary, Lord Halifax, received "intelligence reports from Berlin about an impending German attack on Poland."

What if there was such an attack? Would Britain and France declare war on Germany? As there was no Nazi-Soviet Pact, I assume that the Soviet Union would not invade eastern Poland and therefore Germany would take longer than in OTL to conquer Poland. Or would Poland successfully resist German invasion?
 
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The German Army would need to not be busy with the occupation of Prague. That occurred March 1939. Absent that event there would be a lot more dithering and confusion in Paris & London. The German occupation of Prague and dismemberment of Czechoslovakia 'clarified' the thinking of the British and French leaders. The most recent in a series of treaty violations and arbitrary military actions it showed clearly the nazi government could not be trusted and was after far more than annexation of German populations. If Germany leaves the Czechs alone in March and makes demands on the Poles instead then Chamberlains and Dalliers governments will dither a bit longer. They may take many more days or weeks before going to war against Germany. They may even dither until the Poles collapse and not declare for war at all.

On the military side the Wehrmacht is less prepared than five months later, so the conquest goes a bit slower. For the most part the Poles will be forced out of Warsaw & central Poland in a few weeks. It is possible a enclave in the south east, adjacent to Rumania survives a bit longer. Polish strategy was to withdraw there in hope of keeping a token battle front operating into the winter.

As there was no Nazi-Soviet Pact

In the aftermath of Polands conquest French & British governments are liable to ignore the objections of the anti communists. OTL the negotiations for a Soviet/French alliance were fairly serious, but the anti communist factions in both London and Paris were able to prevent a treaty or alignment. In this case The shock of seeing Poland destroyed may overcome the fear of the Reds & lead to a alliance.
 
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