The defeated consul, who had declared that he would rather die than yield, now shut himself up in his house, and never re-appeared in public until his year of office had expired. Cæsar obtained a ratification of all Pompey’s acts in Asia, and, at the same time, attached the equites to his party, by giving them more favorable terms in farming the provincial revenues. At the close of his consulship he obtained the government of Illyricum and Gaul, on both sides of the Alps, for a term of five years, with a general commission to “protect the friends and allies of the Roman people.”

159. The religious and national bond between the many Celtic tribes which inhabited the ancient territories of Britain, Belgium, France, Switzerland, and a part of Spain, was strong enough to unite them, now and then, in resistance to their common enemies, the Germans on the north and the Romans on the south, but not strong enough to prevent rivalries among themselves, which often gave the foreign power room to interfere in their affairs. The Roman province, founded B. C. 121, now extended northward along the Rhone as far as Geneva; and a great emigration of Germans had occupied territories west of the Rhine, from the neighborhood of the modern Strasbourg to the German Ocean.

160. During his first summer in Gaul, Cæsar, by the extraordinary swiftness and decision of his movements, subdued two nations and established Roman supremacy in the center of the country. The Helvetii, who lived between Lake Geneva and the Jura, finding themselves in too narrow quarters, had resolved to emigrate and conquer new habitations to the westward. They burned their twelve towns and four hundred villages, and assembled at Geneva to the number of 368,000 persons, men, women, and children, intending to pass through the Roman province into western Gaul. Cæsar prevented this move by a wall nineteen miles in length, which he extended along the left bank of the Rhone; and bringing up three legions from Italy, he followed the Helvetians along their second route, and defeated them near Bibrac´te. The remnant of the nation—less than one-third of the number on their muster-rolls when the migration began—were ordered back to their native hills.

The Seq´uani, a Celtic tribe north of the Helvetii, had called in Ariovis´tus, the most powerful of the German chiefs, against their rivals the Ædui, who were styled allies and kinsmen of the Romans. Having subdued the Ædui, Ariovistus turned upon his late allies, and demanded two-thirds of their lands in payment for his services. All the Gauls begged aid of Cæsar, who met the German prince near the Rhine, in what is now Alsace. So great was the fame of Ariovistus and his gigantic barbarians, who for fourteen years had not slept under a roof, that the Roman soldiers were afraid to fight; and though shamed out of their cowardice by the stirring appeal of their general, every man made his will before going into battle. The result of the combat was the complete destruction of the German host, only Ariovistus and a few followers escaping across the Rhine.

161. The second year, Cæsar conquered the Belgians north of the Seine, and the Senate decreed a public thanksgiving of fifteen days for the subjugation of Gaul. His lieutenant, Decimus Brutus, fought the first naval battle on the Atlantic, with the high-built sailing vessels of the Celts. The maritime tribes revolting the following winter, were subdued; and but for a few brief rebellions, the territories of France and Belgium remained under Roman dominion. Cæsar repaired each winter to his province of Cisalpine Gaul, to watch affairs in Italy. In 56 B. C., he had to reconcile Pompey with Crassus, and re-arrange, in his camp at Luca, the affairs of the triumvirate.

It was agreed that Pompey and Crassus should be consuls the next year, and that, after their term had expired, the former should govern Spain, and the latter Asia, while the proconsular government of Cæsar in Gaul should be prolonged to a second term of five years. In choosing the most arduous and least lucrative province for himself, Cæsar wished to begin the execution of his great scheme for civilizing the West, and organizing the whole Roman dominion into one compact state. The revolution begun by the Gracchi was not yet completed, and it was easy to see that the strife of parties must come again to the sword, as it had in the time of Marius and Sulla. In such a case, Cæsar desired to be near Italy, and to have an army trained to perfect discipline and devotion to himself.

162. In the fourth year, B. C. 55, he threw a bridge across the Rhine and invaded Germany. Late in the autumn, he made a reconnoitering expedition to Britain, and received hostages from the tribes. This time the Senate decreed twenty days’ thanksgiving, though Cato stoutly insisted that Cæsar ought, rather, to be given up to the vengeance of the barbarians, to avert the anger of the gods for his having seized the German embassadors. The next year, B. C. 54, Cæsar again invaded Britain with five legions. Notwithstanding the brave resistance of a native chief, Cas´sivelau´nus, he penetrated north of the Thames, took hostages, and imposed tribute; but he left no military posts to hold the island in subjection.

A formidable revolt of the Gauls, the following winter, destroyed one of the six divisions of the Roman army, and imperiled another, commanded by Quintus Cicero, brother of the orator. Cæsar came to its relief, defeated 60,000 of the enemy, and restored quietness to the north. The Germans having aided in this revolt, he again crossed the Rhine near Coblentz, in the summer of 53 B. C. He fought no battles, for the people took refuge among their wooded hills; but the invasion served, as before, to make an imposing display of Roman power.

163. The following year, Gaul was every-where in a blaze of revolt, and the campaign was the most difficult and brilliant of all Cæsar’s operations. Ver´cinget´orix, king of the Arver´ni, and the ablest of the Gallic chieftains, stirred up all the tribes, and nearly wrested the country from Roman control. While Cæsar was besieging him in Ale´sia, a Gallic army of more than a quarter of a million of men encamped around the Romans and besieged them in turn. But the genius of the proconsul surmounted even this crisis. He kept down all attempts at sortie, while he defeated the outer army; then forced the town to surrender, and captured Vercingetorix himself. Six years later, the Gallic chief adorned the triumph of Cæsar, and was then executed in the Mamertine prison at the foot of the Capitol. The Gauls now saw that resistance was hopeless. The firm and skillful management of Cæsar in pacifying the country and organizing the Roman rule, completed the work that his brilliant victories had prepared; and by the year 50 B. C., Gaul was at peace.

164. Meanwhile, Crassus, fearing that his colleagues would reap all the warlike glory of the league, undertook, after plundering the temples of the East, to make war against Parthia—a war unprovoked by the enemy, unauthorized by the Senate, and unwarranted by his own abilities. Contrary to advice, he plunged into the hot and sandy desert east of the Euphrates, lost the greater part of his army in a battle near Carrhæ (the Haran of Abraham), and was himself slain, soon after, by the treachery of the Parthian general, B. C. 53.