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
The constant onset of the hostile swarms hindered the advance, and the battle threatened to resolve itself into a number of confused and detached conflicts; while at the same time Bomilcar with his division detained the corps under Rufus, to prevent it from hastening to the help of the hard- pressed Roman main army. Nevertheless Metellus and Marius with a couple of thousand soldiers succeeded in reaching the foot of the ridge; and the Numidian infantry which defended the heights, in spite of their superior numbers and favourable position, fled almost without resistance when the legionaries charged at a rapid pace up the hill.
The Numidian infantry held its ground equally ill against Rufus; it was scattered at the first charge, and the elephants were all killed or captured on the broken ground. Late in the evening the two Roman divisions, each victorious on its own part and each anxious as to the fate of the other, met between the two fields of battle. It was a battle attesting alike the uncommon military talent of Jugurtha and the indestructible solidity of the Roman infantry, which alone had converted their strategical defeat into a victory. Jugurtha sent home a great part of his troops after the battle, and restricted himself to a guerilla warfare, which he likewise managed with skill.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=45