probably more than merely 居止 or 稽留 “detain.” Cf. infra (“The end and aim of spying …”), where Sun Tzǔ insists that these converted spies shall be treated well. Chang Yü’s paraphrase is 館舍. ↩
Tu Yu expands 因是而知之 into 因反敵間而知敵情 “through conversion of the enemy’s spies we learn the enemy’s condition.” And Chang Yü says: 因是反間知彼鄉人之貪利者官人之有
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