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 besieged were completely driven from the sea. On the landward side, where Gaius Trebonius conducted the siege, the most resolute resistance was still continued; but in spite of the frequent sallies of the Albioecian mercenaries and the skilful expenditure of the immense stores of projectiles accumulated in the city, the works of the besiegers were at length advanced up to the walls and one of the towers fell. The Massiliots declared that they would give up the defence, but desired to conclude the capitulation with Caesar himself, and entreated the Roman commander to suspend the siege operations till Caesar's arrival.
Trebonius had express orders from Caesar to spare the town as far as possible; he granted the armistice desired. But when the Massiliots made use of it for an artful sally, in which they completely burnt the one-half of the almost unguarded Roman works, the struggle of the siege began anew and with increased exasperation. The vigorous commander of the Romans repaired with surprising rapidity the destroyed towers and the mound; soon the Massiliots were once more completely invested.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=46