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
In order to screen a foul transaction, Diaeus, the president of the Achaean league for the time being, about 605 threw out in the diet the assertion that the special privileges conceded by the Achaean league to the Lacedaemonians as members--viz. their exemption from the Achaean criminal jurisdiction, and the right to send separate embassies to Rome--were not at all guaranteed to them by the Romans. It was an audacious falsehood; but the diet naturally believed what it wished, and, when the Achaeans showed themselves ready to make good their assertions with arms in hand, the weaker Spartans yielded for the time, or, to speak more correctly, those whose surrender was demanded by the Achaeans left the city to appear as complainants before the Roman senate.
The senate answered as usual that it would send a commission to investigate the matter; but instead of reporting this reply the envoys stated in Achaia as well as in Sparta, and in both cases falsely, that the senate had decided in their favour. The Achaeans, who felt more than ever their equality with Rome as allies and their political importance on account of the aid which the league had just rendered in Thessaly against the pseudo-Philip, advanced in 606 under their -strategus- Damocritus into Laconia: in vain a Roman embassy on its way to Asia, at the suggestion of Metellus, admonished them to keep the peace and to await the commissioners of the senate.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=76