Inasmuch as the great general and statesman of Rome with sure glance perceived in the German tribes the rival antagonists of the Romano-Greek world; inasmuch as with firm hand he established the new system of aggressive defence down even to its details, and taught men to protect the frontiers of the empire by rivers or artificial ramparts, to colonize the nearest barbarian tribes along the frontier with the view of warding off the more remote, and to recruit the Roman army by enlistment from the enemy's country; he gained for the Hellenico-Italian culture the interval necessary to civilize the west just as it had already civilized the east.
Ordinary men see the fruits of their action; the seed sown by men of genius germinates slowly.

Centuries elapsed before men understood that Alexander had not merely erected an ephemeral kingdom in the east, but had carried Hellenism to Asia; centuries again elapsed before men understood that Caesar had not merely conquered a new province for the Romans, but had laid the foundation for the Romanizing of the regions of the west.

It was only a late posterity that perceived the meaning of those expeditions to England and Germany, so inconsiderate in a military point of view, and so barren of immediate result.

An immense circle of peoples, whose existence and condition hitherto were known barely through the reports--mingling some truth with much fiction--of the mariner and the trader, was disclosed by this means to the Greek and Roman world.

"Daily," it is said in a Roman writing of May 698, "the letters and messages from Gaul are announcing names of peoples, cantons, and regions hitherto unknown to us." This enlargement of the historical horizon by the expeditions of Caesar beyond the Alps was as significant an event in the world's history as the exploring of America by European bands.