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
Thenceforth the defence of the northern and eastern frontiers of Macedonia or, in other words, of the frontier of Greek civilization against the barbarians devolved on the Romans. It was conducted by them with inadequate forces and not, on the whole, with befitting energy; but with a primary view to this military object the great Egnatian highway was constructed, which as early as the time of Polybius ran from Apollonia and Dyrrhachium, the two chief ports on the west coast, across the interior to Thessalonica, and was afterwards prolonged to the Hebrus (Maritza).(18)
18. This road was known already by the author of the pseudo- Aristotelian treatise De Mirabilibus as a commercial route between the Adriatic and Black seas, viz. As that along which the wine jars from Corcyra met halfway those from Thasos and Lesbos. Even now it runs substantially in the same direction from Durazzo, cutting through the mountains of Bagora (Candavian chain) near the lake of Ochrida (Lychnitis), by way of Monastir to Salonica.
The new province became the natural basis, on the one hand for the movements against the turbulent Dalmatians, and on the other hand for the numerous expeditions against the Illyrian, Celtic, and Thracian tribes settled to the north of the Greek peninsula, which we shall afterwards have to exhibit in their historical connection.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=73