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
Counter-Arrangements of Caesar
During these party manoeuvres of his antagonists preparatory to war, Caesar had succeeded in getting rid of the Gallic insurrection and restoring the state of peace in the whole subject territory. As early as the summer of 703, under the convenient pretext of defending the frontier(19) but evidently in token of the fact that the legions in Gaul were now beginning to be no longer needed there, he moved one of them to North Italy.
19. Cf. V. VII. Alpine Peoples
He could not avoid perceiving now at any rate, if not earlier, that he would not be spared the necessity of drawing the sword against his fellow- citizens; nevertheless, as it was highly desirable to leave the legions still for a time in the barely pacified Gaul, he sought even yet to procrastinate, and, well acquainted with the extreme love of peace in the majority of the senate, did not abandon the hope of still restraining them from the declaration of war in spite of the pressure exercised over them by Pompeius. He did not even hesitate to make great sacrifices, if only he might avoid for the present open variance with the supreme governing board.
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Reference address : http://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=41