C. Julius Caesar, Gallic War

It is the greatest glory to the several states to have as wide deserts as possible around them, their frontiers having been laid waste. They consider this the real evidence of their prowess, that their neighbors shall be driven out of their lands and abandon them, and that no one dare settle near them; at the same time they think that they shall be on that account the more secure, because they have removed the apprehension of a sudden incursion. When a state either repels war waged against it, or wages it against another, magistrates are chosen to preside over that war with such authority, that they have power of life and death. In peace there is no common magistrate, but the chiefs of provinces and cantons administer justice and determine controversies among their own people. Robberies which are committed beyond the boundaries of each state bear no infamy, and they avow that these are committed for the purpose of disciplining their youth and of preventing sloth. And when any of their chiefs has said in an assembly "that he will be their leader, let those who are willing to follow, give in their names;" they who approve of both the enterprise and the man arise and promise their assistance and are applauded by the people; such of them as have not followed him are accounted in the number of deserters and traitors, and confidence in all matters is afterward refused them. To injure guests they regard as impious; they defend from wrong those who have come to them for any purpose whatever, and esteem them inviolable; to them the houses of all are open and maintenance is freely supplied.