... consider whether Vercingetorix, standing a captive in the presence of Caesar, was, after all, the nobler leader; nor whether Attila at Chalons was a greater general than Aetius, nor why the sword of Brennus turned the scale on that fateful day at Rome. He is more concerned to know why the Roman legions marched so far, and why the world threw off the imperial yoke. The causes of wars test yet more de...