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's Lines Broken - Caesar Once More Defeated
Pompeius could not much longer delay to free himself from his disagreeable position by a blow struck against the enemy. He was informed by Celtic deserters that the enemy had neglected to secure the beach between his two chains of entrenchments 600 feet distant from each other by a cross-wall, and on this he formed his plan. While he caused the inner line of Caesar's entrenchments to be attacked by the legions from the camp, and the outer line by the light troops placed in vessels and landed beyond the enemy's entrenchments, a third division landed in the space left between the two lines and attacked in the rear their already sufficiently occupied defenders.
The entrenchment next to the sea was taken, and the garrison fled in wild confusion; with difficulty the commander of the next trench Marcus Antonius succeeded in maintaining it and in setting a limit for the moment to the advance of the Pompeians; but; apart from the considerable loss, the outermost entrenchment along the sea remained in the hands of the Pompeians and the lin was broken through. Caesar the more eagerly seized the opportunity, which soon after presented itself, of attacking a Pompeian legion, which had incautiously become isolated, with the bulk of his infantry.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=74