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
Defeat of Arausio
They came in 649 under their king Boiorix, on this occasion seriously meditating an inroad into Italy. They were opposed on the right bank of the Rhone by the proconsul Caepio, on the left by the consul Gnaeus Mallius Maximus and by his legate, the consular Marcus Aurelius Scaurus, under him at the head of a detached corps. The first onset fell on the latter; he was totally defeated and brought in person as a prisoner to the enemy's head-quarters, where the Cimbrian king, indignant at the proud warning given to him by the captive Roman not to venture with his army into Italy, put him to death.
Maximus thereupon ordered his colleague to bring his army over the Rhone: the latter complying with reluctance at length appeared at Arausio (Orange) on the left bank of the river, where the whole Roman force now stood confronting the Cimbrian army, and is alleged to have made such an impression by its considerable numbers that the Cimbri began to negotiate.
But the two leaders lived in the most vehement discord. Maximus, an insignificant and incapable man, was as consul the legal superior of his prouder and better born, but not better qualified, proconsular colleague Caepio; but the latter refused to occupy a common camp and to devise operations in concert with him, and still, as formerly, maintained his independent command. In vain deputies from the Roman senate endeavoured to effect a reconciliation; a personal conference between the generals, on which the officers insisted, only widened the breach.
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Reference address : https://www.ellopos.net/elpenor/rome/4-05-peoples-north.asp?pg=34