Kautilya's Arthashastra 12.3.16

12.3.16

tatkulīnam aparuddhaṃ vā hiraṇyena pratilobhya brūyāt "antarbalaṃ pratyantaskandham antaṃ vāsya pramṛdnīhi" iti //

Or some one of the family (of the commander-in-chief or the king), or one who is imprisoned may be bribed in gold and told: "Destroy the internal strength of the enemy, or a portion of his force in the border of his country."