Arthashastra
एतैः कृत्वा प्रतीकारं स्व सैन्यानाम् अथ आत्मनः । अमित्रेषु प्रयुञ्जीत विष धूम अम्बु दूषणान् ॥
Having applied these remedies to secure the safety of himself and his army, a king should make use of poisonous smokes and other mixtures to vitiate water against his enemy.
english translation
etaiH kRtvA pratIkAraM sva sainyAnAm atha AtmanaH । amitreSu prayuJjIta viSa dhUma ambu dUSaNAn ॥
hk transliteration by Sanscript