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
And Brought Back by Gabinius - A Roman Garrison Remains in Alexandria
Gabinius, without ostensible powers to undertake war against Egypt but directed to do so by the regents, made a pretext out of the alleged furtherance of piracy by the Egyptians and the building of a fleet by Archelaus, and started without delay for the Egyptian frontier (699). The march through the sandy desert between Gaza and Pelusium, in which so many invasions previously directed against Egypt had broken down, was on this occasion successfully accomplished--a result especially due to the quick and skilful leader of the cavalry Marcus Antonius. The frontier fortress of Pelusium also was surrendered without resistance by the Jewish garrison stationed there.
In front of this city the Romans met the Egyptians, defeated them--on which occasion Antonius again distinguished himself--and arrived, as the first Roman army, at the Nile. Here the fleet and army of the Egyptians were drawn up for the last decisive struggle; but the Romans once more conquered, and Archelaus himself with many of his followers perished in the combat. Immediately after this battle the capital surrendered, and therewith all resistance was at an end. The unhappy land was handed over to its legitimate oppressor; the hanging and beheading, with which, but for the intervention of the chivalrous Antonius, Ptolemaeus would have already in Pelusium begun to celebrate the restoration of the legitimate government, now took its course unhindered, and first of all the innocent daughter was sent by her father to the scaffold.
The payment of the reward agreed upon with the regents broke down through the absolute impossibility of exacting from the exhausted land the enormous sums required, although they took from the poor people the last penny; but care was taken that the country should at least be kept quiet by the garrison of Roman infantry and Celtic and German cavalry left in the capital, which took the place of the native praetorians and otherwise emulated them not unsuccessfully. The previous hegemony of Rome over Egypt was thus converted into a direct military occupation, and the nominal continuance of the native monarchy was not so much a privilege granted to the land as a double burden imposed on it.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=74