At Thapsus, April 6, 46 B.C., Caesar took up a post with his army from whence he equally threatened the Roman army under Scipio and the African army under Juba. Scipio having marched off with his troops to a better camp some miles distant, Caesar attacked and annihilated Juba’s army.
At Pirna, Frederic the Great, captured the Saxon army entire, and at Rossbach, Leuthern and Zorndorf destroyed successively a French, an Austrian and a Russian army merely by occupying a post from whence he equally threatened two or more vital points, awaiting the time when one would become inadequately defended.
Washington won the Revolutionary War merely by occupying a post from whence he equally threatened the British armies at New York and Philadelphia; refusing battle and building up an army of Continental regular troops enlisted for the war and trained by the Baron von Steuben in the system of Frederic the Great.
Bonaparte won at Montenotte, Castiglione, Arcola, Rivoli and Austerlitz his most perfect exhibitions of generalship, merely by passively threatening two vital points and in his own words: “By never interrupting an enemy when he is making a false movement.”
Perfection in Mobility is attained whenever the kindred army is able to act unrestrainedly in any and all directions, while the movements of the hostile army are restricted.