Nevertheless the result of the last campaigns was the almost complete reduction of Gaul under the dominion of the Romans.

While central Gaul had submitted to it without resistance, during the campaign of 697 the Belgic, and during that of the following year the maritime, cantons had been compelled by force of arms to acknowledge the Roman rule.
The lofty hopes, with which the Celtic patriots had begun the last campaign, had nowhere been fulfilled.

Neither Germans nor Britons had come to their aid; and in Belgica the presence of Labienus had sufficed to prevent the renewal of the conflicts of the previous year.
Establishment of Communications with Italy by the Valais While Caesar was thus forming the Roman domain in the west by force of arms into a compact whole, he did not neglect to open up for the newly-conquered country--which was destined in fact to fill up the wide gap in that domain between Italy and Spain-communications both with the Italian home and with the Spanish provinces.

The communication between Gaul and Italy had certainly been materially facilitated by the military road laid out by Pompeius in 677 over Mont Genevre;( 40) but since the whole of Gaul had been subdued by the Romans, there was need of a route crossing the ridge of the Alps from the valley of the Po, not in a westerly but in a northerly direction, and furnishing a shorter communication between Italy and central Gaul.

The way which leads over the Great St.Bernard into the Valais and along the lake of Geneva had long served the merchant for this purpose; to get this road into his power, Caesar as early as the autumn of 697 caused Octodurum (Martigny) to be occupied by Servius Galba, and the inhabitants of the Valais to be reduced to subjection--a result which was, of course, merely postponed, not prevented, by the brave resistance of these mountain-peoples.
And with Spain To gain communication with Spain, moreover, Publius Crassus was sent in the following year (698) to Aquitania with instructions to compel the Iberian tribes dwelling there to acknowledge the Roman rule.