The lion has claws, reverse Dynamo

This is a wild one. In may 40' instead of evacuating the Dunkirk Calais area, the allies pull back to a defensive position on the Zeebruge - Bruges - Ypres - st omer - montreil general line. The RAF is fully committed to keep sea lanes open and to forward deploy to prevent the LW from securing air supremacy. The French army rushes all it has across the med back home and goes double or nothing in first containing the Germans north of the abeville soissons general line and then counter attacking to link with the forces on the "bastion".
It's a gamble, and it requires the Brits and the French ( and, yes, the belgians too) to stick to their guns. Opinions? And can we leave the usual "supergermans vs hopelessly retarded allies cliches out for a few posts?
 
The first question is, how fast can the Allies move troops & supplies here?

And the second one that comes to mind: How much difference can the troops across the Mediterranean make when they finally (And in this kind of situation, even if it works smoothly - and in war, I would not bet on that - "finally." is the word) arrive?

I have the sneaking suspicion this is going to increase Allied casualties, but not improve results.

Not because the Allies are superretarded, but because you don't evacuate a position unless there's a reason to.
 
The main problem, as Elfwine has said, is that you'd have to have the British and French doing some very fast work on rearranging their LoS. The British lines of supply went through Northern France - with those severed then things would get a mite hairy.
 
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Crisis managment

Those cross med forces were on my mind mostly because of the follow on battles. The big battle I'm imagining, a sort of 1940 Marne, would be over in maybe two weeks. If the allies decid not to evacuate, but rather hold to a defensible perimeter and counterattack, Guderian is going to find himself at the end of a long corridor, boxed btw the rivers Somme and Canche. The entire german "corridor is within 155 GPF firing range. since both sides have more or less equal forces, and since the Germans were always short of trucks, it's a case of who manages to rearrange forces better. German superior staff work will probably prevail, but clever use of a few B1bis and Matildas can make a lot of damage in places. The Germans will have to get infantry units inside the "corridor" ASAP, but that means marches. If the BEF stays and fights, the RAF must follow, and the French Air Force was actually getting better as the campaign went on. For the French there is no way things can get worst than OTL, for the Brits if things go wrong there will be no professional core to rebuild the Army, but the Germans will have much higher casualties on the battles. This could end with a more or less stable front not far from the original WW1 frontline.
What got me thinking about this was another what if, in this case the if being would a german breakthrough in first Ypres in 1914 ended WW1 in France. And plan yellow has a certain "super 1st Ypres" thing about it...
 
LoS

The main problem, as Elfwine has said, is that you'd have to have the British and French doing some very fast work on rearranging their LoS. The British lines of supply went through Northern France - with those severed then things would get a mite hairy.

If the allied forces on the north hold on to their positions they are going to be supplied across the channel. Since they will still hold boulogne, Calais and Dunkirk they are in fact fighting with a very short, pratical LoS. The British will concentrate on holding the northern "bastion" and counterattacking southwards with the French and Belgian forces stuck with them. The rest of he French army will be rushing to reinforce the Somme line and organise a counterattack to either rejoin with the Brits or to cut off Guderian.
There was a French plan along those lines, but Dynamo and the mess the French made of their staff work after general Billote died in a car crash made it a stillborn hope.
 
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