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 Roman army under the consul Lucius Cassius Longinus, which they here encountered, allowed itself to be decoyed by the Helvetii into an ambush, in which the general himself and his legate, the consular Lucius Piso, along with the greater portion of the soldiers met their death; Gaius Popillius, the interim commander-in-chief of the force which had escaped to the camp, was allowed to withdraw under the yoke on condition of surrendering half the property which the troops carried with them and furnishing hostages (647). So perilous was the state of things for the Romans, that one of the most important towns in their own province, Tolosa, rose against them and placed the Roman garrison in chains.
But, as the Cimbri continued to employ themselves elsewhere, and the Helvetii did not further molest for the moment the Roman province, the new Roman commander-in-chief, Quintus Servilius Caepio, had full time to recover possession of the town of Tolosa by treachery and to empty at leisure the immense treasures accumulated in the old and famous sanctuary of the Celtic Apollo. It was a desirable gain for the embarrassed exchequer, but unfortunately the gold and silver vessels on the way from Tolosa to Massilia were taken from the weak escort by a band of robbers, and totally disappeared: the consul himself and his staff were, it was alleged, the instigators of this onset (648).
Meanwhile they confined themselves to the strictest defensive as regarded the chief enemy, and guarded the Roman province with three strong armies, till it should please the Cimbri to repeat their attack.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/4-05-peoples-north.asp?pg=33