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
Battle at the Nile
The junction took place without the enemy attempting to hinder it. Caesar then marched into the Delta, whither the king had retreated, overthrew, notwithstanding the deeply cut canal in their front, the Egyptian vanguard at the first onset, and immediately stormed the Egyptian camp itself. It lay at the foot of a rising ground between the Nile--from which only a narrow path separated it-- and marshes difficult of access.
Caesar caused the camp to be assailed simultaneously from the front and from the flank on the path along the Nile; and during this assault ordered a third detachment to ascend unseen the heights behind the camp. The victory was complete the camp was taken, and those of the Egyptians who did not fal beneath the sword of the enemy were drowned in the attempt to escape to the fleet on the Nile. With one of the boats, which sank overladen with men, the young king also disappeared in the waters of his native stream.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=107