Teng Ming-shih informs us that the surname "Sun" was bestowed on Sun Wu’s grandfather by Duke Ching of Ch’i [547-490 B.C.]. Sun Wu’s father Sun P’ing, rose to be a Minister of State in Ch’i, and Sun Wu himself, whose style was Ch’ang-ch’ing, fled to Wu on account of the rebellion which was being fomented by the kindred of T’ien Pao. He had three sons, of whom the second, named Ming, was the father of Sun Pin. According to this account then, Pin was the grandson of Wu, which, considering that Sun Pin’s victory over Wei was gained in 341 B.C., may be dismissed as chronologically impossible. Whence these data were obtained by Teng Ming-shih I do not know, but of course no reliance whatever can be placed in them. An interesting document which has survived from the close of the Han period is the short preface written by the Great Ts’ao Ts’ao, or Wei Wu Ti, for his edition of Sun Tzŭ. I shall give it in full:— I have heard that the ancients used bows and arrows to their advantage. [10] The _Lun Yu_ says: “There must be a sufficiency of military strength.” The _Shu Ching_ mentions "the army" among the "eight objects of government." The _I Ching_ says: "‘army’ indicates firmness and justice; the experienced leader will have good fortune." The _Shih Ching_ says: "The King rose majestic in his wrath, and he marshalled his troops." The Yellow Emperor, T’ang the Completer and Wu Wang all used spears and battle-axes in order to succour their generation. The _Ssu-ma Fa_ says: "If one man slay another of set purpose, he himself may rightfully be slain." He who relies solely on warlike measures shall be exterminated; he who relies solely on peaceful measures shall perish. Instances of this are Fu Ch’ai [11] on the one hand and Yen Wang on the other. [12] In military matters, the Sage’s rule is normally to keep the peace, and to move his forces only when occasion requires. He will not use armed force unless driven to it by necessity. Many books have I read on the subject of war and fighting; but the work composed by Sun Wu is the profoundest of them all. [Sun Tzŭ was a native of the Ch’i state, his personal name was Wu. He wrote the _Art of War_ in 13 chapters for Ho Lu, King of Wu. Its principles were tested on women, and he was subsequently made a general. He led an army westwards, crushed the Ch’u state and entered Ying the capital. In the north, he kept Ch’i and Chin in awe. A hundred years and more after his time, Sun Pin lived. He was a descendant of Wu.] [13] In his treatment of deliberation and planning, the importance of rapidity in taking the field, [14] clearness of conception, and depth of design, Sun Tzŭ stands beyond the reach of carping criticism. My contemporaries, however, have failed to grasp the full meaning of his instructions, and while putting into practice the smaller details in which his work abounds, they have overlooked its essential purport. That is the motive which has led me to outline a rough explanation of the whole.