Lycurgus

The king marched against the enemy in close companionship with one who had been crowned victor in the great games. And they tell of a certain Spartan who refused to be bought off from a contest at Olympia by large sums of money, and after a long struggle outwrestled his antagonist. When some one said to him then: What advantage, O Spartan, hast thou got from thy victory? he answered, with a smile: I shall stand in front of my king when I fight our enemies.

When they had conquered and routed an enemy, they pursued him far enough to make their victory secure by his flight, and then at once retired, thinking it ignoble and unworthy of a Hellene to hew men to pieces who had given up the fight and abandoned the field. And this was not only a noble and magnanimous policy, but it was also useful. For their antagonists, knowing that they slew those who resisted them, but showed mercy to those who yielded to them, were apt to think flight more advantageous than resistance.