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
The only relations established were of a mercantile kind; as in the instance of the free state of Rhodes, the leading representative of the policy of commercial neutrality in Greece and in consequence the universal medium of intercourse in an age of perpetual wars, which about 448 concluded a treaty with Rome --a commercial convention of course, such as was natural between a mercantile people and the masters of the Caerite and Campanian coasts.
Even in the supply of mercenaries from Greece, the universal recruiting field of those times, to Italy, and to Tarentum in particular, political relations--such as subsisted, for instance, between Tarentum and Sparta its mother-city--exercised but a very subordinate influence.
In general the raising of mercenaries was simply a matter of traffic, and Sparta, although it regularly supplied the Tarentines with captains for their Italian wars, was by that course as little involved in hostilities with the Italians, as in the North American war of independence the German states were involved in hostilities with the Union, to whose opponents they sold the services of their subjects.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=3