Arthashastra
शक्तिमत्तराश् च पौरा जानपदेभ्यो नित्याश् च आपदि सहाया राज्ञः ॥
they are a stronger power than the citizens or country people; and they are a powerful defensive instrument in times of danger for the king.
english translation
zaktimattarAz ca paurA jAnapadebhyo nityAz ca Apadi sahAyA rAjJaH ॥
hk transliteration by Sanscript