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
With justice the greatest masters of war of all times have praised Caesar the general, who, in a singular degree disregarding routine and tradition, knew always how to find out the mode of warfare by which in the given case the enemy was conquered, and which was thus in the given case the right one; who with the certainty of divination found the proper means for every end; who after defeat stood ready for battle like William of Orange, and ended the campaign invariably with victory; who managed that element of warfare, the treatment of which serves to distinguish military genius from the mere ordinary ability of an officer--the rapid movement of masses--with unsurpassed perfection, and found the guarantee of victory not in the massiveness of his forces but in the celerity of their movements, not in long preparation but in rapid and daring action even with inadequate means.
But all these were with Caesar mere secondary matters; he was no doubt a great orator, author, and general, but he became each of these merely because he was a consummate statesman. The soldier more especially played in him altogether an accessory part, and it is one of the principal peculiarities by which he is distinguished from Alexander, Hannibal, and Napoleon, that he began his political activity not as an officer, but as a demagogue. According to his original plan he had purposed to reach his object, like Pericles and Gaius Gracchus, without force of arms, and throughout eighteen years he had as leader of the popular party moved exclusively amid political plans and intrigues--until, reluctantly convinced of the necessity for a military support, he, when already forty years of age, put himself at the head of an army.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=7