Kautilya's Arthashastra 13.3.52

13.3.52

kṛtasaṃketam annapānaṃ cātra madanarasaviddhaṃ vā kṛtvāpagaccheyuḥ //

The same spies, together with those described in "Removal of thorns" may, by employing thieves, destroy the flock of the enemy's cattle or merchandise in the vicinity of wild tracts. They may poison with the juice of the madana plant, the food-stuffs and beverage kept, as previously arranged, in a definite place for the enemy's cowherds, and go out unknown. When the cowherds show signs of intoxication in consequence of their eating the above food-stuffs, spies, disguised as cowherds, merchants, and thieves, may fall upon the enemy's cowherds, and carry off the cattle.