Kautilya's Arthashastra 7.3.14

7.3.14

vigṛhītaś cet "paraprakṛtayo lubdhakṣīṇāpacaritā vigrahodvignā vā māṃ nopagacchanti" iti paśyej jyāyān api saṃdhīyeta, vigrahodvegaṃ vā śamayet //

When a king at war with another finds that greedy, impoverished, and oppressed as are the subjects of his enemy, still they do not come to his side in consequence of the troubles of war, then he should, though of superior power, make peace with his enemy or remove the troubles of war as far as possible.