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 fate of the Eburones was dreadful. However they might hide themselves in forests and morasses, there were more hunters than game. Many put themselves to death like the gray-haired prince Catuvolcus; only a few saved life and liberty, but among these few was the man whom the Romans sought above all to seize, the prince Ambiorix; with but four horsemen he escaped over the Rhine. This execution against the canton which had transgressed above all the rest was followed in the other districts by processes of high treason against individuals.
The season for clemency was past. At the bidding of the Roman proconsul the eminent Carnutic knight Acco was beheaded by Roman lictors (701) and the rule of the -fasces- was thus formally inaugurated. Opposition was silent; tranquillity everywhere prevailed. Caesar went as he was wont towards the end of the year (701) over the Alps, that through the winter he might observe more closely the daily-increasing complications in the capital.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=107