Kautilya's Arthashastra 9.2.18

9.2.18

āryādhiṣṭhitam amitrabalam aṭavībalāt śreyaḥ //

The army of an enemy under the leadership of an Arya is better than the army of wild tribes. Both of them (the army of an enemy and of wild tribes) are anxious for plunder. In the absence of plunder and under troubles, they prove as dangerous as a lurking snake.