"If one compares Clausewitz and Foch, one will see that Foch before the World War strongly emphasized the demoralization of the enemy as the military objective; whereas Clausewitz, thinking more coolly and more comprehensively, reminded his readers that the capture or killing of the enemy constitutes in the tactical sphere the final destruction of his ability to fight on, whereas his moral overthrow constitutes only a conditioned, or generally only a temporary elimination."