Case Yellow

If the BF108 carrying the plans for Case Yellow never crashed at Mechelen - 10 January 1940 - then
A) Would the German High Command have stuck to the original plan, in which case how do the allies fair against this new Schlieflen plan
or
B) Will the German High Command drop it and adopt Mansteins plan anyway.
 
If the Germans just do a strong right and smack into the Allies forming up on the Dyle River. As long as the Germans do a strong armored breakthrough concept, backed by their air superiority, perhaps they still plunge through the allied lines at some point and reach something critical.

Higher casualties on both sides certainly, perhaps the B.E.F doesn't escape but is pushed southward. France remaining Vichy or staying in the game was a close run thing OTL, here the politics changes (does Weygand still take over and when etc...), France might stay in.

I am thinking higher German casualties with France staying in instead of going Vichy, with the fight in front of Paris lasting a month longer.
 
As the battle of Gembleux showed, the main French formations were quite capable of stopping German armoured thrusts, even in the face of air superiority, if they were given the possibility to dig in.

Also, as later battles in the closing stages of the campaign showed, the French were beginning to learn how to deal with the Germans quite well.

If the Germans strike against the best allied formations head-on, with the latter ready and waiting, it will be less a question of maneuver and more on of firepower, in which the allies had the upper hand.
 
The plan in the 108 was not the final one - up to this point and after the plan was changed several times.

Current believe is that the "incident" had no impact on the final plan
 
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