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 Countries on the Danube
To complete the sketch of the relations of Rome to the peoples of the north at this period, it remains that we cast a glance at the countries which stretch to the north of the Italian and Greek peninsulas, from the sources of the Rhine to the Black Sea. It is true that the torch of history does not illumine the mighty stir and turmoil of peoples which probably prevailed at that time there, and the solitary gleams of light that fall on this region are, like a faint glimmer amidst deep darkness, more fitted to bewilder than to enlighten. But it is the duty of the historian to indicate also the gaps in the record of the history of nations; he may not deem it beneath him to mention, by the side of Caesar's magnificent system of defence, the paltry arrangements by which the generals of the senate professed to protect on this side the frontier of the empire.
North-eastern Italy was still as before(56) left exposed to the attacks of the Alpine tribes.
56. Cf. IV. V. Taurisci
The strong Roman army encamped at Aquileia in 695, and the triumph of the governor of Cisalpine Gaul Lucius Afranius, lead us to infer, that about this time an expedition to the Alps took place, and it may have been in consequence of this that we find the Romans soon afterwards in closer connection with a king of the Noricans. But that even subsequently Italy was not at all secure on this side, is shown by the sudden assault of the Alpine barbarians on the flourishing town of Tergeste in 702, when the Transalpine insurrection had compelled Caesar to divest upper Italy wholly of troops.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=143