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
At the same time skirmishing went on on the opposite side of Caesar's camp with the garrison of Dyrrhachium; Caesar hoped to get the fortress into his power by means of an understanding with some of its inmates, but was prevented by the enemy's fleet. There was incessant fighting at very different points--on one of the hottest days at six places simultaneously-- and, as a rule, the tried valour of the Caesarians had the advantage in these skirmishes; once, for instance, a single cohort maintained itself in its entrenchments against four legions for several hours, till support came up.
No prominent success was attained on either side; yet the effects of the investment came by degrees to be oppressively felt by the Pompeians. The stopping of the rivulets flowing from the heights into the plain compelled them to be content with scanty and bad well-water. Still more severely felt was the want of fodder for the beasts of burden and the horses, which the fleet was unable adequately to remedy; numbers of them died, and it was of but little avail that the horses were conveyed by the fleet to Dyrrhachium, because there also they did not find sufficient fodder.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=73