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
Provisional Arrangement of the Affairs of the Capital - The Provinces
Without further concerning himself about the senate and the formalities of state law, he handed over the temporary administration of the capital to the praetor Marcus Aemilius Lepidus as city-prefect, and made the requisite arrangements for the administration of the provinces that obeyed him and the continuance of the war. Even amidst the din of the gigantic struggle, and with all the alluring sound of Caesar's lavish promises, it still made a deep impression on the multitude of the capital, when they saw in their free Rome the monarch for the first time wielding a monarch's power and breaking open the doors of the treasury by his soldiers. But the times had gone by, when the impressions and feelings of the multitude determined the course of events; it was with the legions that the decision lay, and a few painful feelings more or less were of no farther moment.
Pompeians in Spain
Caesar hastened to resume the war. He owed his successes hitherto to the offensive, and he intended still to maintain it. The position of his antagonist was singular. After the original plan of carrying on the campaign simultaneously in the two Gauls by offensive operations from the bases of Italy and Spain had been frustrated by Caesar's aggressive, Pompeius had intended to go to Spain. There he had a very strong position. The army amounted to seven legions; a large number of Pompeius' veterans served in it, and several years of conflicts in the Lusitanian mountains had hardened soldiers and officers.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=34