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
Caesar Re-establishes the Communications
Thereupon Caesar formed his plan. He ordered portable boats of a light wooden frame and osier work lined with leather, after the model of those used in the Channel among the Britons and subsequently by the Saxons, to be prepared in the camp and transported in waggons to the point where the bridges had stood. On these frail barks the other bank was reached and, as it was found unoccupied, the bridge was re-established without much difficulty; the road in connection with it was thereupon quickly cleared, and the eagerly-expected supplies were conveyed to the camp.
Caesar's happy idea thus rescued the army from the immense peril in which it was placed. Then the cavalry of Caesar which in efficiency far surpassed that of the enemy began at once to scour the country on the left bank of the Sicoris; the most considerable Spanish communities between the Pyrenees and the Ebro--Osca, Tarraco, Dertosa, and others--nay, even several to the south of the Ebro, passed over to Caesar's side.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : http://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=39