The Republic by Plato Part 5 Page 71

enslave them, if they can help? Should not their custom be to spare them, considering the danger which there is that the whole race may one day fall under the yoke of the barbarians?

To spare them is infinitely better.

Then no Hellene should be owned by them as a slave; that is a rule which they will observe and advise the other Hellenes to observe.

Certainly, he said; they will in this way be united against the barbarians and will keep their hands off one another.

Next as to the slain; ought the conquerors, I said, to take anything but their armour? Does not the practice of despoiling an enemy afford an excuse for not facing the battle? Cowards skulk about the dead, pretending that they are fulfilling a duty, and many