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
Landing of the Romans in Macedonia
In the autumn of 554 the consul, Publius Sulpicius Galba, landed with his two legions and 1000 Numidian cavalry accompanied even by elephants derived from the spoils of Carthage, at Apollonia; on receiving accounts of which the king returned in haste from the Hellespont to Thessaly. But, owing partly to the far-advanced season, partly to the sickness of the Roman general, nothing was undertaken by land that year except a reconnaissance in force, in the course of which the townships in the vicinity, and in particular the Macedonian colony Antipatria, were occupied by the Romans. For the next year a joint attack on Macedonia was concerted with the northern barbarians, especially with Pleuratus, the then ruler of Scodra, and Bato, prince of the Dardani, who of course were eager to profit by the favourable opportunity.
More importance attached to the enterprises of the Roman fleet, which numbered 100 decked and 80 light vessels. While the rest of the ships took their station for the winter at Corcyra, a division under Gaius Claudius Cento proceeded to the Piraeeus to render assistance to the hard-pressed Athenians. But, as Cento found the Attic territory already sufficiently protected against the raids of the Corinthian garrison and the Macedonian corsairs, he sailed on and appeared suddenly before Chalcis in Euboea, the chief stronghold of Philip in Greece, where his magazines, stores of arms, and prisoners were kept, and where the commandant Sopater was far from expecting a Roman attack. The undefended walls were scaled, and the garrison was put to death; the prisoners were liberated and the stores were burnt; unfortunately, there was a want of troops to hold the important position.
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Reference address : https://www.ellopos.net/elpenor/rome/3-08-second-macedonian-war.asp?pg=41