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Walther von Brauchitsch was the Commander-in-Chief of the Wehrmacht on the eve of Fall Gelb, the amended invasion plan for France and the Low Countries.
However, though Hitler privately claimed otherwise, the authorship of the final plan can be primarily attributed to one of Brauchitsch's subordinators, the famous Erich von Manstein; an officer who was able to convince Hitler to adopt it in lieu of more conservative battle plans favored by Brauchitsch in early 1940.
So the POD is that upon OTL's meeting with Manstein,Hitler is so impressed with the compatibility of the plan and thus the man's strategic vision with his own ideology, decides to sack Brauchitsch and replace him with Erich.
What effects might we see for the Wehrmacht throughout the rest of the war?