But this thirst of blood was checked in the days of slavery by the counteracting thirst of money; there having been an obvious motive for giving quarter when a prisoner of war represented something of tangible value, like any other article of booty. The sack of Thebes by Alexander, and its demolition to the sound of the lute, was bad enough; but after the first rage for slaughter was over, there remained 30,000 persons of free birth to be sold as slaves. And in Roman warfare the rule was to sell as slaves those who were taken prisoners in a stormed city; and it must be remembered that many so sold were slaves already.[148] All who were unarmed or who laid down their arms were spared from destruction, as well as from plunder;[149] and for exceptions to this rule, as for instance for the indiscriminate and cruel massacre committed at Illiturji in Spain, there was always at least the pretext of reprisals, or some special military motive.[150] Cicero, who lived to see the Roman arms triumphant over the world and the conversion of the Roman republic into a military despotism, found occasion to deplore at the same time the debased standard of military honour. He believed that in cruel vindictiveness and rapacity his contemporaries had degenerated from the customs of their ancestors, and he contrasted regretfully the utter destruction of Carthage, Numantia, and Corinth, with the milder treatment of their earlier enemies, the Sabines, Tusculans, and others. He adduced as a proof of the greater ferocity of the war spirit of his day the fact that the only term for an enemy was originally the milder term of stranger, and that it was only by degrees that the word meaning stranger came to have the connotation of hostility. ‘What,’ he asks, ‘could have been added to this mildness, to call him with whom you are at war by so gentle a name as stranger? But now the progress of time has given a harder signification to the word; for it has ceased to apply to a stranger, and has remained the proper term for an actual enemy in arms.’[151] Is a similar process taking place in modern warfare with regard to the law of reprisals? It is a long leap from ancient Rome to modern Germany; but to Germany, as the chief military Power now in existence, we must turn, in order to understand the law of reprisals as it is interpreted by the practice of a country whose power and example will make her actions precedents in all wars that may occur in future.