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
Pompeius with the cavalry was defeated by Sertorius, and his brother-in-law and quaestor, the brave Lucius Memmius, was slain; on the other hand Metellus vanquished Perpenna, and victoriously repelled the attack of the enemy's main army directed against him, receiving himself a wound in the conflict. Once more the Sertorian army dispersed. Valentia, which Gaius Herennius held for Sertorius, was taken and razed to the ground. The Romans, probably for a moment, cherished a hope that they were done with their tough antagonist. The Sertorian army had disappeared; the Roman troops, penetrating far into the interior, besieged the general himself in the fortress Clunia on the upper Douro. But while they vainly invested this rocky stronghold, the contingents of the insurgent communities assembled elsewhere; Sertorius stole out of the fortress and even before the expiry of the year stood once more as general at the head of an army.
Again the Roman generals had to take up their winter quarters with the cheerless prospect of an inevitable renewal of their Sisyphean war-toils. It was not even possible to choose quarters in the region of Valentia, so important on account of the communication with Italy and the east, but fearfully devastated by friend and foe; Pompeius led his troops first into the territory of the Vascones(22) (Biscay) and then spent the winter in the territory of the Vaccaei (about Valladolid), and Metellus even in Gaul.
22. In the recently found fragments of Sallust, which appear to belong to the campaign of 679, the following words relate to this incident: -Romanus [exer]citus (of Pompeius) frumenti gra[tia r]emotus in Vascones i... [it]emque Sertorius mon... e, cuius multum in[terer]it, ne ei perinde Asiae [iter et Italiae intercluderetur].
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=47