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, apart from the circumstance that the Spanish troops might arrive in Italy with the spring either by the land route through Gaul or by sea, the men of the three legions still remaining from the levies of 699,(11) as well as the Italian levy sworn to allegiance in 702,(12) could be recalled from their furlough.
11. Cf. V. VIII. Settlement of the New Monarchial Rule
12. Cf. V. VIII. Changes in the Arrangement of Magistracies and the Jury-System
Including these, the number of troops standing at the disposal of Pompeius on the whole, without reckoning the seven legions in Spain and those scattered in other provinces, amounted in Italy alone to ten legions(13) or about 60,000 men, so that it was no exaggeration at all, when Pompeius asserted that he had only to stamp with his foot to cover the ground with armed men.
13. This number was specified by Pompeius himself (Caesar, B.C. i. 6), and it agrees with the statement that he lost in Italy about 60 cohorts or 30,000 men, and took 25,000 over to Greece (Caesar, B.C. iii. 10).
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=16