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
Relieving Army from Asia Minor
At length the longed-for relief arrived. Mithradates of Pergamus, an able warrior of the school of Mithradates Eupator, whose natural son he claimed to be, brought up by land from Syria a motley army-- the Ityraeans of the prince of the Libanus,(43) the Bedouins of Jamblichus, son of Sampsiceramus,(44) the Jews under the minister Antipater, and the contingents generally of the petty chiefs and communities of Cilicia and Syria.
43. Cf. V. IV. Robber-Chiefs
44. Cf. V. IV. Robber-Chiefs
From Pelusium, which Mithradates had the fortune to occupy on the day of his arrival, he took the great road towards Memphis with the view of avoiding the intersected ground of the Delta and crossing the Nile before its division; during which movement his troops received manifold support from the Jewish peasants who were settled in peculiar numbers in this part of Egypt. The Egyptians, with the young king Ptolemaeus now at their head, whom Caesar had released to his people in the vain hope of allaying the insurrection by his means, despatched an army to the Nile, to detain Mithradates on its farther bank.
This army fell in with the enemy even beyond Memphis at the so-called Jews'-camp, between Onion and Heliopolis; nevertheless Mithradates, trained in the Roman fashion of manoeuvring and encamping, amidst successful conflicts gained the opposite bank at Memphis. Caesar, on the other hand, as soon as he obtained news of the arrival of the relieving army, conveyed a part of his troops in ships to the end of the lake of Marea to the west of Alexandria, and marched round this lake and down the Nile to meet Mithradates advancing up the river.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=106