WI someone saw through hitler's "marching drill ruse"?

what if a leader (any one) did not believe that hitler was only doing marching drills on the french and belgium borders and decided not to appease him but to to declare war earlier (against popular opinion).

Would Hitler cower if he did not have the early successes in invasions, or would he declare it an injustice and come at any enemy harder? Who would sympathize with hitler that didn't in OTL?
 
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