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
The flame of war now blazed up far and wide. The Lusitanians on the left bank of the Tagus, led by Caucaenus, threw themselves on the Celtici subject to the Romans (in Alentejo), and took away their town Conistorgis. The Lusitanians sent the standards taken from Mummius to the Celtiberians at once as an announcement of victory and as a warning; and among these, too, there was no want of ferment. Two small Celtiberian tribes in the neighbourhood of the powerful Arevacae (about the sources of the Douro and Tagus), the Belli and the Titthi, had resolved to settle together in Segeda, one of their towns.
While they were occupied in building the walls, the Romans ordered them to desist, because the Sempronian regulations prohibited the subject communities from founding towns at their own discretion; and they at the same time required the contribution of money and men which was due by treaty but for a considerable period had not been demanded. The Spaniards refused to obey either command, alleging that they were engaged merely in enlarging, not in founding, a city, and that the contribution had not been merely suspended, but remitted by the Romans.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=5