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
Organizations of Sertorius
These extraordinary successes obtained by Sertorius in the two Spanish provinces were the more significant, that they were not achieved merely by arms and were not of a mere military nature. The emigrants as such were not formidable; nor were isolated successes of the Lusitanians under this or that foreign leader of much moment. But with the most decided political and patriotic tact Sertorius acted, whenever he could do so, not as condottiere of the Lusitanians in revolt against Rome, but as Roman general and governor of Spain, in which capacity he had in fact been sent thither by the former rulers. He began(16) to form the heads of the emigration into a senate, which was to increase to 300 members and to conduct affairs and to nominate magistrates in Roman form.
16. At least the outline of these organizations must be assigned to the years 674, 675, 676, although the execution of them doubtless belonged, in great part, only to the subsequent years.
He regarded his army as a Roman one, and filled the officers' posts, without exception, with Romans. When facing the Spaniards, he was the governor, who by virtue of his office levied troops and other support from them; but he was a governor who, instead of exercising the usual despotic sway, endeavoured to attach the provincials to Rome and to himself personally.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=28