tactics. One of his works has been in constant use down to the present
day. The _T’ung Chih_ mentions "Lives of famous generals from the Chou
to the T’ang dynasty" as written by him. [42] According to Ch’ao
Kung-wu and the _T’ien-i-ko_ catalogue, he followed a variant of the
text of Sun Tzŭ which differs considerably from those now extant. His
notes are mostly short and to the point, and he frequently illustrates
his remarks by anecdotes from Chinese history.