Because of the numerous mistakes in the text of Sun Tzǔ which his editors had handed down, the Government ordered that the ancient edition [of Chi Tʽien-pao ] should be used, and that the text should be revised and corrected throughout. It happened that Wu Nien-hu , the Governor Pi Kua , and Hsi , a graduate of the second degree, had all devoted themselves to this study, probably surpassing me therein. Accordingly, I have had the whole work cut on blocks as a textbook for military men. 90