With all this wealth of discovery, Pytheas returned home by the Bay of Biscay to the mouth of the Gironde; thence he sailed up the Garonne, and from the modern town of Bordeaux he reached Marseilles by an overland journey.
CHAPTER VII
JULIUS CÆSAR AS EXPLORER
Our next explorer is Julius Cæsar. As Alexander the Great had combined the conqueror with the explorer, so now history repeats itself, and we find the Roman Cæsar not only conquering, but exploring. It was Cæsar who first dispelled the mist that lay over the country about the French Seine, the German Rhine, the English Thames—Cæsar who gives us the first graphic account of crossing the English Channel from France to England. Pytheas had hinted at the fog-bound lands of the north—Cæsar brought them into the light of day.
Since the days of Alexander the centre of Empire had shifted from Greece to Rome, and Rome was now conquering and annexing land, as Persia had done in the olden days. Hence it was that Julius Cæsar was in the year 58 B.C. appointed Governor of a new province recently brought under Roman sway, stretching from the Alps to the Garonne and northward to the Lake of Geneva, which at this time marked the frontier of the Roman Empire. Cæsar made no secret of his intentions to subdue the tribes to the north of his province and bring all Gaul under the dominion of Rome. His appointment carried with it the command of four legions, including some twenty thousand soldiers. His chance soon came, and we find Cæsar, with all the ability of a great commander, pushing forward with his army into the very heart of France one hundred and fifty miles beyond the Roman frontier.
On the banks of the river Saône he defeated a large body of Celtic people who were migrating from Switzerland to make their homes in the warmer and roomier plains at the foot of the Pyrenees.
While the defeated Celts returned to their chilly homes among the mountains, victorious Cæsar resolved to push on at the head of his army toward the Rhine, where some German tribes under a "ferocious headstrong savage" threatened to overrun the country. After marching through utterly unknown country for three days, he heard that fresh swarms of invaders had crossed the Rhine, intending to occupy the more fertile tracts on the French side. They were making for the town we now call Besançon—then, as now, strongly fortified, and nearly surrounded by the river Doubs. By forced marches night and day, Cæsar hastened to the town and took it before the arrival of the invaders.