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WI Chamberlain resigns Sept 3rd 1939 or he has a heart attack and Churchill takes over. Will his tough personality be able have much influence on Daladier and / or Weygand.
I would think that even if he cant get the french to move into the Rhineland
if the battle of Norway occurs in April 1940 or sooner ? the RN will be free to take much more preemptive and effective actions to the point that Weserbung is defeated.