Arthashastra
प्रभाववान् उत्साहवन्तं राजानं प्रभावेन अतिसंधत्ते तद् विशिष्टम् अन्यं राजानम् आवाह्य भृत्वा क्रीत्वा प्रवीर पुरुषान् ॥
A powerful monarch overcomes an energetic king through his own superior might; he does so by summoning , hiring, or purchasing another distinguished king and heroic warriors.
english translation
prabhAvavAn utsAhavantaM rAjAnaM prabhAvena atisaMdhatte tad viziSTam anyaM rAjAnam AvAhya bhRtvA krItvA pravIra puruSAn ॥
hk transliteration by Sanscript