Flavius Josephus, The Wars of the Jews
William Whiston, A.M., Ed.

[102] Now they so manage their preparatory exercises of their weapons, that not the bodies of the soldiers only, but their souls may also become stronger: they are moreover hardened for war by fear; for their laws inflict capital punishments, not only for soldiers running away from the ranks, but for slothfulness and inactivity, though it be but in a lesser degree; as are their generals more severe than their laws, for they prevent any imputation of cruelty toward those under condemnation, by the great rewards they bestow on the valiant soldiers; and the readiness of obeying their commanders is so great, that it is very ornamental in peace; but when they come to a battle, the whole army is but one body, so well coupled together are their ranks, so sudden are their turnings about, so sharp their hearing as to what orders are given them, so quick their sight of the ensigns, and so nimble are their hands when they set to work; whereby it comes to pass that what they do is done quickly, and what they suffer they bear with the greatest patience. Nor can we find any examples where they have been conquered in battle, when they came to a close fight, either by the multitude of the enemies, or by their stratagems, or by the difficulties in the places they were in; no, nor by fortune neither, for their victories have been surer to them than fortune could have granted them. In a case, therefore, where counsel still goes before action, and where, after taking the best advice, that advice is followed by so active an army, what wonder is it that Euphrates on the east, the ocean on the west, the most fertile regions of Libya on the south, and the Danube and the Rhine on the north, are the limits of this empire? One might well say that the Roman possessions are not inferior to the Romans themselves.