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
Of the two consular armies, each of which numbered about 25,000 infantry and 1100 cavalry, one was stationed in Sardinia under Gaius Atilius Regulus, the other at Ariminum under Lucius Aemilius Papus. Both received orders to repair as speedily as possible to Etruria, which was most immediately threatened.
The Celts had already been under the necessity of leaving a garrison at home to face the Cenomani and Veneti, who were allied with Rome; now the levy of the Umbrians was directed to advance from their native mountains down into the plain of the Boii, and to inflict all the injury which they could think of on the enemy upon his own soil.
The militia of the Etruscans and Sabines was to occupy the Apennines and if possible to obstruct the passage, till the regular troops could arrive. A reserve was formed in Rome of 50,000 men. Throughout all Italy, which on this occasion recognized its true champion in Rome, the men capable of service were enrolled, and stores and materials of war were collected.
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Reference address : https://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=32