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
When Caesar on his return from the conquest of Spain arrived before their city, he found it reduced to extremities partly by the enemy's attacks, partly by famine and pestilence, and ready for the second time--on this occasion in right earnest-- to surrender on any terms. Domitius alone, remembering the indulgence of the victor which he had shamefully misused, embarked in a boat and stole through the Roman fleet, to seek a third battle-field for his implacable resentment. Caesar's soldiers had sworn to put to the sword the whole male population of the perfidious city, and vehemently demanded from the general the signal for plunder.
But Caesar, mindful here also of his great task of establishing Graeco-Italic civilization in the west, was not to be coerced into furnishing a sequel to the destruction of Corinth. Massilia--the most remote from the mother-country of all those cities, once so numerous, free, and powerful, that belonged to the old Ionic mariner-nation, and almost the last in which the Greek seafaring life had preserved itself fresh and pure, as in fact it was the last Greek city that fought at sea--Massilia had to surrender its magazines of arms and naval stores to the victor, and lost a portion of its territory and of its privileges; but it retained its freedom and its nationality and continued, though with diminished proportions in a material point of view, to be still as before intellectually the centre of Greek culture in that distant Celtic country which at this very time was attaining a new historical significance.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=47