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
Preparations in Rome-- Commencement of the Conflict in Lower Italy
The Romans too were well aware of the conflict which awaited them. In order first of all to secure the fidelity of their allies or, in other words, of their subjects, the towns that could not be depended on were garrisoned, and the leaders of the party of independence, where it seemed needful, were arrested or executed: such was the case with a number of the members of the senate of Praeneste.
For the war itself great exertions were made; a war contribution was levied; the full contingent was called forth from all their subjects and allies; even the proletarians who were properly exempt from obligation of service were called to arms. A Roman army remained as a reserve in the capital. A second advanced under the consul Tiberius Coruncanius into Etruria, and dispersed the forces of Volci and Volsinii.
The main force was of course destined for Lower Italy; its departure was hastened as much as possible, in order to reach Pyrrhus while still in the territory of Tarentum, and to prevent him and his forces from forming a junction with the Samnites and other south Italian levies that were in arms against Rome. The Roman garrisons, that were placed in the Greek towns of Lower Italy, were intended temporarily to check the king's progress.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=24