Arthashastra
तस्मात् सहस्र एकीयः पुरस्ताल् लाभस्य अयोगः शत एकीयो वा पश्चात् कोप इति न यायात् ॥
When one under the protection of another has come to such a condition (i.e., slight annoyance in the rear and considerable profit in the front), then one should endeavour so as to cause to the rear enemy the loss and impoverishment of his servants and friends;
english translation
tasmAt sahasra ekIyaH purastAl lAbhasya ayogaH zata ekIyo vA pazcAt kopa iti na yAyAt ॥
hk transliteration by Sanscript