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
It was rumoured (Oct. 704) that Caesar had moved four legions
from Transalpine into Cisalpine Gaul and stationed them at Placentia.
This transference of troops was of itself within the prerogative
of the governor; Curio moreover palpably showed in the senate
the utter groundlessness of the rumour; and they by a majority
rejected the proposal of the consul Gaius Marcellus to give
Pompeius on the strength of it orders to march against Caesar.
Yet the said consul, in concert with the two consuls elected for 705
who likewise belonged to the Catonian party, proceeded to Pompeius,
and these three men by virtue of their own plenitude of power
requested the general to put himself at the head of the two legions
stationed at Capua, and to call the Italian militia to arms
at his discretion. A more informal authorization for the commencement
of a civil war can hardly be conceived; but people had no longer time
to attend to such secondary matters; Pompeius accepted it.
The military preparations, the levies began; in order personally
to forward them, Pompeius left the capital in December 704.