In this state of affairs imperial Rome cast a glance over the Alps upon Gaul, and resolved upon its conquest and annexation to the empire. Julius Cæsar, at the head of forty thousand men, descended through the defiles of the mountains and entered Gaul between the Lake of Geneva and Mount Jura. After a series of campaigns extending through ten years, and after sweeping with his invincible legions nearly two millions of men from his path, he succeeded in the entire subjugation of the country. Roman governors were appointed over the several provinces, and fortresses were reared and garrisoned by twelve hundred Roman soldiers, who enforced the laws of the empire. The arts, the civilization, and the refinements of Rome were gradually extended over the semi-barbaric Gauls, and for nearly four hundred years the country enjoyed general peace and prosperity. The southern portion of the province became distinguished for its schools, its commerce, and its elegance. Toward the close of the third century the Roman Empire, enervated by luxury and vice, was visibly on the decline. Then commenced that mighty flood of invasion from the north which finally overran the whole of southern Europe, sweeping before it almost every vestige of the power and grandeur of the Cæsars. Army after army of skin-clad warriors, in aspect savage as wolves and equally merciless, crossed the Rhine, and in fierce and interminable battle fought their way over the plains of Gaul. For nearly four hundred years barbarian hordes from the shores of the North Sea, from the steppes of Tartary, even from far-off China, were pouring down upon southern Europe. Those in the rear crowded forward those in the advance. These clannish tribes, every where victorious, were slow to amalgamate. Each retained its distinctive laws, language, customs, and manners. For more than two centuries this cruel war continued, and all Gaul presented but a scene of tumult, terror, and carnage. Among the marshes of the Lower Rhine there dwelt a fierce tribe called Franks, or Freemen. Early in the fifth century, Pharamond, the sovereign chief of this tribe, a man of extraordinary energy and sagacity, formed a confederacy with several other adjacent tribes, crossed the Rhine at various points, and after a series of terrific conflicts, which were protracted through many years, overpowered the Gauls under their Roman leaders, and took possession of the country nearly as far as the River Somme. Being the leading chief of the confederated tribes, he exerted a kind of supremacy over the rest, which may perhaps be considered as the first dawning of the French monarchy. The successors of Pharamond retained his conquests, and gradually extended their dominions until they were in possession of all the country between the Rhine and the Loire.