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
But still more than by the superiority of valour the adversaries of Caesar felt themselves humbled by the unchangeable and touching fidelity with which his soldiers clung to their general. It is perhaps without a parallel in history, that when the general summoned his soldiers to follow him into the civil war, with the single exception already mentioned of Labienus, no Roman officer and no Roman soldier deserted him. The hopes of his opponents as to an extensive desertion were thwarted as ignominiously as the former attempts to break up his army like that of Lucullus.(4)
4. Cf. V. IX. Debates as to Caesar's Recall
Labienus himself appeared in the camp of Pompeius with a band doubtless of Celtic and German horsemen but without a single legionary. Indeed the soldiers, as if they would show that the war was quite as much their matter as that of their general, settled among themselves that they would give credit for the pay, which Caesar had promised to double for them at the outbreak of the civil war, to their commander up to its termination, and would meanwhile support their poorer comrades from the general means; besides, every subaltern officer equipped and paid a trooper out of his own purse.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=8