The Art of War by active 6th century B.C. Sunzi

4. _Wei Liao Tzŭ_, in 5 _chuan_. Attributed to Wei Liao (4th cent.

B.C.), who studied under the famous Kuei-ku TzÅ­. The work appears to have been originally in 31 chapters, whereas the text we possess contains only 24. Its matter is sound enough in the main, though the strategical devices differ considerably from those of the Warring States period. It is been furnished with a commentary by the well-known Sung philosopher Chang Tsai.