Arthashastra
अन्त पालो वा दुर्ग सम्प्रदाने बल एक देशम् अतिनीय विश्वस्तं घातयेत् ॥
Having access to the enemy's castle, the officer in charge of the boundaries (of the enemy's country) may lead a part of his force and slay the enemy in good faith under the plea of destroying a people in some place, he may take the enemy to an inimical army.
english translation
anta pAlo vA durga sampradAne bala eka dezam atinIya vizvastaM ghAtayet ॥
hk transliteration by Sanscript