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
Conflicts on the Frontier - In the Alps
It would have been no easy task for a government more energetic than was the Roman government of that day to establish an organized and adequate defence of the frontier against these wide domains of barbarism; what was done for this important object under the auspices of the government ment of the restoration, did not come up to even the most moderate requirements.
There seems to have been no want of expeditions against the inhabitants of the Alps: in 636 there was a triumph over the Stoeni, who were probably settled in the mountains above Verona; in 659 the consul Lucius Crassus caused the Alpine valleys far and wide to De ransacked and the inhabitants to be put to death, and yet he did not succeed in killing enough of them to enable him to celebrate a village triumph and to couple the laurels of the victor with his oratorical fame.
But as the Romans remained satisfied with razzias of this sort which merely exasperated the natives without rendering them harmless, and, apparently, withdrew the troops again after every such inroad, the state of matters in the region beyond the Po remained substantially the same as before.
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Reference address : https://www.ellopos.net/elpenor/rome/4-05-peoples-north.asp?pg=18