Again, if under stress of circumstance individuals have made any promise to the enemy, they are bound to keep their word even then. For instance, in the First Punic War, when Regulus was taken prisoner by the Carthaginians, he was sent to Rome on parole to negotiate an exchange of prisoners; he came and, in the first place, it was he that made the motion in the Sen ate that the prisoners should not be restored; and in the second place, when his relatives and friends would have kept him back, he chose to return to a death by torture rather than prove false to his promise, though given to an enemy.

{40} And again in the Second Punic War, after the Battle of Cannae, Hannibal sent to Rome ten Roman captives bound by an oath to return to him, if they did not succeed in ransoming his prisoners; and as long as any one of them lived, the censors kept them all degraded and disfranchised, because they were guilty of perjury in not returning. And they punished in like manner the one who had incurred guilt by an evasion of his oath: with Hannibal's permission this man left the camp and returned a litttle later on the pretext that he had forgotten something or other; and then, when he left the camp the second time, he claimed that he was released from the obligation of his oath; and so he was, according to the letter of it, but not according to the spirit. In the matter of a promise one must always consider the meaning and not the mere words. Our forefathers have given us another striking example of justice toward an enemy: when a deserter from Pyrrhus promised the Senate to administer poison to the king and thus work his death, the Senate and Gaius Fabricius delivered the deserter up to Pyrrhus. Thus they stamped with their disapproval the treacherous murder even of an enemy who was at once powerful, unprovoked, aggressive, and successful.

{41} With this I will close my discussion of the duties connected with war. But let us remember that we must have regard for justice even towards the humblest. Now the humblest station and the poorest fortune are those of slaves; and they give us no bad rule who bid us treat our slaves as we should our employees: they must be required to work; they must be given their dues. While wrong may be done, then, in either of two ways, that is, by force or by fraud, both are bestial: fraud seems to belong to the cunning fox, force to the lion; both are wholly unworthy of man, but fraud is the more contemptible. But of all forms of injustice, none is more flagrant than that of the hypocrite who, at the very moment when he is most false, makes it his business to appear virtuous. This must conclude our discussion of justice.

Marcus Tullus Cicero: De Officiis, Translated by Walter Miller