A singularity of the famous Art of War (孫子兵法) attributed to Sunzi is the way this work conceives of knowledge as a resource for the military strategist. The idea is new in Chinese tradition, and new in the worldwide context of thinking about strategy, where Sunzi’s ideas about the value of knowledge are far in advance of the thinking of Western theorists like Machiavelli or especially Clausewitz. The role of knowledge in the Sunzi theory of strategy and the consistency of what this work says about knowledge with a philosophical idea of knowledge that emerges in Warring States texts of diverse genres are analyzed here.