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
Progress of the War
Meanwhile, the spring of 554 had arrived, and the war had recommenced. Philip first threw himself once more upon Thrace, where he occupied all the places on the coast, in particular Maronea, Aenus, Elaeus, and Sestus; he wished to have his European possessions secured against the risk of a Roman landing. He then attacked Abydus on the Asiatic coast, the acquisition of which could not but be an object of importance to him, for the possession of Sestus and Abydus would bring him into closer connection with his ally Antiochus, and he would no longer need to be apprehensive lest the fleet of the allies might intercept him in crossing to or from Asia Minor.
That fleet commanded the Aegean Sea after the withdrawal of the weaker Macedonian squadron: Philip confined his operations by sea to maintaining garrisons on three of the Cyclades, Andros, Cythnos, and Paros, and fitting out privateers. The Rhodians proceeded to Chios, and thence to Tenedos, where Attalus, who had passed the winter at Aegina and had spent his time in listening to the declamations of the Athenians, joined them with his squadron.
The allies might probably have arrived in time to help the Abydenes, who heroically defended themselves; but they stirred not, and so at length the city surrendered, after almost all who were capable of bearing arms had fallen in the struggle before the walls.
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Reference address : https://www.ellopos.net/elpenor/rome/3-08-second-macedonian-war.asp?pg=33