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
Messengers arrived from the Thessalians, announcing that the pretender had advanced into their territory; the Roman commissioner Nasica, who, in the expectation that a word of earnest remonstrance would put an end to the foolish enterprise, had been sent by the senate to Macedonia without soldiers, was obliged to call out the Achaean and Pergamene troops and to protect Thessaly against the superior force by means of the Achaeans, as far as was practicable, till (605?) the praetor Juventius appeared with a legion. The latter attacked the Macedonians with his small force; but he himself fell, his army was almost wholly destroyed, and the greater part of Thessaly fell into the power of the pseudo-Philip, who conducted his government there and in Macedonia with cruelty and arrogance.
At length a stronger Roman army under Quintus Caecilius Metellus appeared on the scene of conflict, and, supported by the Pergamene fleet, advanced into Macedonia. In the first cavalry combat the Macedonians retained the superiority; but soon dissensions and desertions occurred in the Macedonian army, and the blunder of the pretender in dividing his army and detaching half of it to Thessaly procured for the Romans an easy and decisive victory (606). Philip fled to the chieftain Byzes in Thrace, whither Metellus followed him and after a second victory obtained his surrender.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=70