Arthashastra
सुरुङ्गाम् अमित्र स्थाने बहु मुखीं कृत्वा निचय मुख्यान् अभिहारयेत्, अमित्रं वा ॥
having widened the mouth of the underground tunnel of the enemy's fort, his stores and leaders may be removed; the enemy may also be likewise carried off.
english translation
suruGgAm amitra sthAne bahu mukhIM kRtvA nicaya mukhyAn abhihArayet, amitraM vA ॥
hk transliteration by Sanscript