Gallic War

There was left one way, [namely] through the Sequani, by which, on account of its narrowness, they could not pass without the consent of the Sequani. As they could not of themselves prevail on them, they send embassadors to Dumnorix the Aeduan, that through his intercession, they might obtain their request from the Sequani. Dumnorix, by his popularity and liberality, had great influence among the Sequani, and was friendly to the Helvetii, because out of that state he had married the daughter of Orgetorix; and, incited by lust of sovereignty, was anxious for a revolution, and wished to have as many states as possible attached to him by his kindness toward them. He, therefore, undertakes the affair, and prevails upon the Sequani to allow the Helvetii to march through their territories, and arranges that they should give hostages to each other-the Sequani not to obstruct the Helvetii in their march-the Helvetii, to pass without mischief and outrage.

It is again told Caesar, that the Helvetii intended to march through the country of the Sequani and the Aedui into the territories of the Santones, which are not far distant from those boundaries of the Tolosates, which [viz. Tolosa, Toulouse] is a state in the Province. If this took place, he saw that it would be attended with great danger to the Province to have warlike men, enemies of the Roman people, bordering upon an open and very fertile tract of country. For these reasons he appointed Titus Labienus, his lieutenant, to the command of the fortification which he had made. He himself proceeds to Italy by forced marches, and there levies two legions, and leads out from winter-quarters three which were wintering around Aquileia, and with these five legions marches rapidly by the nearest route across the Alps into Further Gaul. Here the Centrones and the Graioceli and the Caturiges, having taken possession of the higher parts, attempt to obstruct the army in their march. After having routed these in several battles, he arrives in the territories of the Vocontii in the Further Province on the seventh day from Ocelum, which is the most remote town of the Hither Province; thence he leads his army into the country of the Allobroges, and from the Allobroges to the Segusiani. These people are the first beyond the Province on the opposite side of the Rhone.

The Helvetii had by this time led their forces over through the narrow defile and the territories of the Sequani, and had arrived at the territories of the Aedui, and were ravaging their lands. The Aedui, as they could not defend themselves and their possessions against them, send embassadors to Caesar to ask assistance, [pleading] that they had at all times so well deserved of the Roman people, that their fields ought not to have been laid waste-their children carried off into slavery-their towns stormed, almost within sight of our army. At the same time the Ambarri, the friends and kinsmen of the Aedui, apprize Caesar, that it was not easy for them, now that their fields had been devastated, to ward off the violence of the enemy from their towns: the Allobroges likewise, who had villages and possessions on the other side of the Rhone, betake themselves in flight to Caesar, and assure him that they had nothing remaining, except the soil of their land. Caesar, induced by these circumstances, decides, that he ought not to wait until the Helvetii, after destroying all the property of his allies, should arrive among the Santones.

There is a river [called] the Saone, which flows through the territories of the Aedui and Sequani into the Rhone with such incredible slowness, that it can not be determined by the eye in which direction it flows. This the Helvetii were crossing by rafts and boats joined together. When Caesar was informed by spies that the Helvetii had already conveyed three parts of their forces across that river, but that the fourth part was left behind on this side of the Saone, he set out from the camp with three legions during the third watch, and came up with that division which had not yet crossed the river. Attacking them encumbered with baggage, and not expecting him, he cut to pieces a great part of them; the rest betook themselves to flight, and concealed themselves in the nearest woods. That canton [which was cut down] was called the Tigurine; for the whole Helvetian state is divided into four cantons. This single canton having left their country, within the recollection of our fathers, had slain Lucius Cassius the consul, and had made his army pass under the yoke. Thus, whether by chance, or by the design of the immortal gods, that part of the Helvetian state which had brought a signal calamity upon the Roman people, was the first to pay the penalty. In this Caesar avenged not only the public but also his own personal wrongs, because the Tigurini had slain Lucius Piso the lieutenant [of Cassius], the grandfather of Lucius Calpurnius Piso, his [Caesar's] father-in-law, in the same battle as Cassius himself.