The enemy’s spies who have come to spy on us must be sought out,
必索 is omitted by the _T‘ung Tien_ and _Yü Lan_. Its recurrence is
certainly suspicious, though the sense may seem to gain by it. The
_T‘u Shu_ has this variation: ... 敵間之來間吾者, etc.
tempted with bribes, led away and comfortably housed.
舍 is probably more than merely 居止 or 稽留 “detain.” Cf. § 25 _ad
fin._, where Sun Tzŭ insists that these converted spies shall be
treated well. Chang Yü’s paraphrase is 館舍.
Thus they will become converted spies and available for our service.