General WWII -France doesn't fall TL questions

For the purposes of this TL that while suffering *considerable* damage, that neither Paris nor Marseille falls to to the Axis.

1) How much reduction in U-boat activity is reasonable between the addition of the French Navy to the cause, the lack of French Ports for U-Boats and other factors?

2) Does an effort of the Italians and Germans to encircle Switzerland make sense, or is that a narrow a corridor?

3) Lend Lease more likely? Can the French also get in on the Destroyers for Bases?

4) For France abandon the periferies(sp?) (specifically Indochina) to save Metropolitan France or not? If not, that's another thing for the Japanese to have to attack when it starts the War in the Pacific. Still got enough to attack Pearl?

5) How long can the Axis last?
 
For the purposes of this TL that while suffering *considerable* damage, that neither Paris nor Marseille falls to to the Axis.

1) How much reduction in U-boat activity is reasonable between the addition of the French Navy to the cause, the lack of French Ports for U-Boats and other factors?

2) Does an effort of the Italians and Germans to encircle Switzerland make sense, or is that a narrow a corridor?

3) Lend Lease more likely? Can the French also get in on the Destroyers for Bases?

4) For France abandon the periferies(sp?) (specifically Indochina) to save Metropolitan France or not? If not, that's another thing for the Japanese to have to attack when it starts the War in the Pacific. Still got enough to attack Pearl?

5) How long can the Axis last?

If depends where the Allies stopped the Germans :

- in Belgium and the germans armored columns are stopped in the Ardennes,

- somewhere in northern France where the Germans panzers are destroyed because they are undergunned or underarmored by the bigs tanks the French and the British have, or because the germans infantry is stopped far away from the panzers who are cut and destoyed piecemeals,

It is important, because the first solution means the Allies don't realized the importance of the armored forces, and because the Italians can think twice before attacking a foe who was able to stop the Germans only after one or two weeks.

For the rest, after Operation Dynamo and the destruction of the best of the Allies forces in Belgium and northen France, stopping the German invasion is really ASB. A miracle on the Marne in 1940 was really impossible...
 
If the Germans don't succeed at first, Mussolini might declare neutrality (He almost did, and the French even offered colonies and land in return for Neutrality), so if Mussolini sees the Germans moving too slow, he might take France's offer. I see it as a World War I style thing then.
 
5) Not very. If the German advance bogs down in France, things fall apart. Italy stays neutral, German morale collapses (most still remember the Great War), and a two-front war reduces the effort available for Barbarossa. If the latter is forgone, and France is severely debilitated, Ribbentrop might negotiate the return of Alsace-Lorraine. But I wouldn't count on it.
 
5) Not very. If the German advance bogs down in France, things fall apart. Italy stays neutral, German morale collapses (most still remember the Great War), and a two-front war reduces the effort available for Barbarossa. If the latter is forgone, and France is severely debilitated, Ribbentrop might negotiate the return of Alsace-Lorraine. But I wouldn't count on it.
The return to whom?
 
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