who had served under the Hsia. Likewise, the rise of the Chou dynasty was due to Lü Ya
呂尚 Lü Shang, whose "style" was 子牙，rose to high office under the tyrant 紂辛 Chou Hsin, whom he afterwards helped to overthrow. Popularly known as 太公，a title bestowed on him by Wên Wang, he is said to have composed a treatise on war, erroneously identified with the 六韜.
who had served under the Yin.
27. Hence it is only the enlightened ruler and the wise general who will use the highest intelligence of the army for purposes of spying,