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
Illyrian Piracy - Expedition against Scodra
Even the evil of piracy, which was naturally in such a state of matters the only trade that flourished on the Adriatic coast, and from which the commerce of Italy suffered greatly, was submitted to by the Romans with an undue measure of patience, --a patience intimately connected with their radical aversion to maritime war and their wretched marine. But at length it became too flagrant.
Favoured by Macedonia, which no longer found occasion to continue its old function of protecting Greek commerce from the corsairs of the Adriatic for the benefit of its foes, the rulers of Scodra had induced the Illyrian tribes--nearly corresponding to the Dalmatians, Montenegrins, and northern Albanians of the present day--to unite for joint piratical expeditions on a great scale.
With whole squadrons of their swift-sailing biremes, the veil-known "Liburnian" cutters, the Illyrians waged war by sea and along the coasts against all and sundry. The Greek settlements in these regions, the island-towns of Issa (Lissa) and Pharos (Lesina), the important ports of Epidamnus (Durazzo) and Apollonia (to the north of Avlona on the Aous) of course suffered especially, and were repeatedly beleaguered by the barbarians.
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Reference address : https://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=20