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Liddell Hart's "Strategy of the Indirect Approach". His work was studied by both Guderian and Rommel prior to WWII.
https://en.wikipedia.org/wiki/B._H._Liddell_HartIn Liddell Hart's words,
In strategy the longest way round is often the shortest way there; a direct approach to the object exhausts the attacker and hardens the resistance by compression, whereas an indirect approach loosens the defender's hold by upsetting his balance.
As a corollary he explained
The profoundest truth of war is that the issue of battle is usually decided in the minds of the opposing commanders, not in the bodies of their men.
Hart and Fuller fathered the "Blitzkreig" strategy