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 neighbouring peoples did likewise. The Dardani on the northern frontier as well as the Thracians in the east had no doubt been humbled by the Romans in the eight years' conflicts from 676 to 683; the most powerful of the Thracian princes, Cotys, the ruler of the old Odrysian kingdom, was thenceforth numbered among the client kings of Rome. Nevertheless the pacified land had still as before to suffer invasions from the north and east. The governor Gaius Antonius was severely handled both by the Dardani and by the tribes settled in the modern Dobrudscha, who, with the help of the dreaded Bastarnae brought up from the left bank of the Danube, inflicted on him an important defeat (692-693) at Istropolis (Istere, not far from Kustendji).
Gaius Octavius fought with better fortune against the Bessi and Thracians (694). Marcus Piso again (697-698) as general-in-chief wretchedly mismanaged matters; which was no wonder, seeing that for money he gave friends and foes whatever they wished. The Thracian Dentheletae (on the Strymon) under his governorship plundered Macedonia far and wide, and even stationed their posts on the great Roman military road leading from Dyrrhachium to Thessalonica; the people in Thessalonica made up their minds to stand a siege from them, while the strong Roman army in the province seemed to be present only as an onlooker when the inhabitants of the mountains and neighbouring peoples levied contributions from the peaceful subjects of Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=145