This military commander w
This military commander withdrew from a failed siege in three columns rather than en masse, which is regarded as an expedient to cover an army that was at large. This commander created what was, in effect, a line of circumvallation in two sieges separated by two years, the latter of which resulted in the loss of an entire siege train. The tactic for which this commander is best known later plunged the army he commanded into the "open jaws of disaster" according to this commander's most influential critic, who noted that this commander could afford to be innovative since he had no superiors to second-guess him, unlike most generals. That tactic is the concentrating of forces on a single flank to make up for inferiority in numbers by defeating the enemy in detail and is known as the "oblique order." For 10 points,  name this military commander, the most frequently mentioned in Clausewitz's On War, who reigned as King of Prussia from 1740-1786.
This military commander withdrew from a failed siege in three columns rather than en masse, which is regarded as an expedient to cover an army that was at large.
Frederick the Great (or Frederick II; accept "Old Fritz")