Arthashastra
ततः शत्रु भूमि लिप्सायां मित्रेण आत्मन्य् अपकारयित्वा अभियुञ्जीत इति समानाः पूर्वेण सर्व एव योगाः ॥
and when he goes to seize the territory, the conqueror may ask his (the conqueror's) friend to offend him (the conqueror), and then enable the friend to catch hold of the enemy.
english translation
tataH zatru bhUmi lipsAyAM mitreNa Atmany apakArayitvA abhiyuJjIta iti samAnAH pUrveNa sarva eva yogAH ॥
hk transliteration by Sanscript