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When Poland is attacked, France and the UK mererly mobilizes, UK send its ground forces into France but officially, only for strictly defensive purposes.
They strongly protest, the RN establish a naval blockade, but ultimately they do not declare war to Germany on the ground that Dantzig isn´t Polish territory and that Poland is doomed anywhay.
Hovewer, when Hitler launch his attack against the Soviet-Union, allied begin mobilizing, declarations of war (scheduled to be given approx 1 hour before the start of the operations) and an launch an all-out invasion of the Rhineland start 15 days later.
The Soviets where made to agree to France and the UK having to decide which governement will rule post-war Poland in exchange for this assistance, though territories taken back in 39 would be recognized as legitimate.

Part A) The Objective is to seize the Rhineland, secure it from German counter-attacks with a line of defence along the Rhine, eventually dismantle at least some of its infrastructure to support the allied war effort.

Part B) If containement cannot be achieved, demolition teams will do their best to wreck local infrastructures needed for the German war effort.

Part C) Attack on Rhineland will distract the Germans from the attack on Norway.

Part D) Assist the Soviet-Union, if necessary.

Part E) France and the UK begin building a large army in the Rhineland to invade the rest of Germany, attack is scheduled for 1942. Evidently, if the opportunity should arise, they may strike sooner.

Note: Should German forces strike through the Franco-German border against the troops in Alsace-Lorraine instead of going against the Soviet-Union, the allies would be caught completely unprepared for defensive warfare(As much forces are being mobilized for the coming attack, the Maginot line is almost completely unmanned) and their defeat would be even worst than it was historically. Unlikely scenario, thought.


Big problem, how could France and the UK come to adopt such a strategy?

It would assume a better understanding of Hitler´s motives, know that Molotov-Ribbentrop Treaty is just a cover and that Hitler still intend, in the immediate, to expand Germany east after Poland instead of conquering western europe. Hovewer, they would still believe that he will turn his armies west once that is done.
They could still believe the West Wall is unbreakable if manned, the success of the attack would evidently count on the effect of surprise.

Someone with at least semi-decent strategic thinking would have to replace either Chamberlain or Daladier.
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