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
Cimbrian Movements and Conflicts - Defeat of Carbo
This homeless people of the Cimbri, which hitherto had been prevented from advancing to the south by the Celts on the Danube, more especially by the Boii, broke through that barrier in consequence of the attacks directed by the Romans against the Danubian Celts; either because the latter invoked the aid of their Cimbrian antagonists against the advancing legions, or because the Roman attack prevented them from protecting as hitherto their northern frontiers.
Advancing through the territory of the Scordisci into the Tauriscan country, they approached in 641 the passes of the Carnian Alps, to protect which the consul Gnaeus Papirius Carbo took up a position on the heights not far from Aquileia. Here, seventy years before, Celtic tribes had attempted to settle on the south of the Alps, but at the bidding of the Romans had evacuated without resistance the ground which they had already occupied;(18) even now the dread of the Transalpine peoples at the Roman name showed itself strongly.
18. Cf. III. VII. Measures Adopted to Check the Immigrations of the Transalpine Gauls
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Reference address : http://www.ellopos.net/elpenor/rome/4-05-peoples-north.asp?pg=29