Kautilya's Arthashastra 12.2.8

12.2.8

tathāpi pratiṣṭhamānasya prakṛtikopam asya kārayed yathā saṃghavṛtte vyākhyātaṃ yogavāmane ca //

If without caring for the advice, the enemy proceeds on his own way, the weak king should create disaffection among the enemy's people by adopting such measures as are explained in the chapters, "The Conduct of Corporations," and "Enticement of the enemy by secret contrivances." He should also make use of fiery spies and poison. Against what is described as deserving protection in the chapter, "Safety of his own person," fiery spies and poisoners should be employed (in the enemy's court). Keepers of harlots should excite love in the minds of the leaders of the enemy's army by exhibiting women endowed with youth and beauty. Fiery spies should bring about quarrels among them when one or two of them have fallen in love. In the affray that ensues they should prevail upon the defeated party to migrate elsewhere or to proceed to help the master (of the spies) in the invasion undertaken by the latter.