Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The new commander-in-chief, Gaius Marius, appeared in 650 beyond the Alps, followed by a number of experienced officers--among whom the bold captor of Jugurtha, Lucius Sulla, soon acquired fresh distinction-- and by a numerous host of Italian and allied soldiers. At first he did not find the enemy against whom he was sent. The singular people, who had conquered at Arausio, had in the meantime (as we have already mentioned), after plundering the country to the west of the Rhone, crossed the Pyrenees and were carrying on a desultory warfare in Spain with the brave inhabitants of the northern coast and of the interior; it seemed as if the Germans wished at their very first appearance in the field of history to display their lack of persistent grasp.
So Marius found ample time on the one hand to reduce the revolted Tectosages to obedience, to confirm afresh the wavering fidelity of the subject Gallic and Ligurian cantons, and to obtain support and contingents within and without the Roman province from the allies who were equally with the Romans placed in peril by the Cimbri, such as the Massiliots, the Allobroges, and the Sequani; and on the other hand, to discipline the army entrusted to him by strict training and impartial justice towards all whether high or humble, and to prepare the soldiers for the more serious labours of war by marches and extensive works of entrenching--particularly the construction of a canal of the Rhone, afterwards handed over to the Massiliots, for facilitating the transit of the supplies sent from Italy to the army. He maintained a strictly defensive attitude, and did not cross the bounds of the Roman province.
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Reference address : https://www.ellopos.net/elpenor/rome/4-05-peoples-north.asp?pg=42