Page:Sun Tzu on The art of war.djvu/29

 and of course the 13 chapters must have been written earlier still. But at that time, and for several years after, down to the capture of Ying in 506, Ch‘u, and not Yüeh, was the great hereditary enemy of Wu. The two states, Ch‘u and Wu, had been constantly at war for over half a century, whereas the first war between Wu and Yüeh was waged only in 510, and even then was no more than a short interlude sandwiched in the midst of the fierce struggle with Ch‘u. Now Ch‘u is not mentioned in the 13 chapters at all. The natural inference is that they were written at a time when Yüeh had become the prime antagonist of Wu, that is, after Ch‘u had suffered the great humiliation of 506. At this point, a table of dates may be found useful.