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
Scipio Goes to Andalusia - Hasdrubal Crosses the Pyrenees
Scipio employed the winter of 545-6 in breaking up his fleet and
increasing his land army with the men thus acquired, so that he
might at once guard the north and assume the offensive in the south
more energetically than before; and he marched in 546 to Andalusia.
There he: encountered Hasdrubal Barcas, who, in the execution of his
long-cherished plan, was moving northward to the help of his brother.
A battle took place at Baecula, in which the Romans claimed the
victory and professed to have made 10,000 captives; but Hasdrubal
substantially attained his end, although at the sacrifice of a portion
of his army. With his chest, his elephants, and the best portion of
his troops, he fought his way to the north coast of Spain; marching
along the shore, he reached the western passes of the Pyrenees which
appear to have been unoccupied, and before the bad season began he
was in Gaul, where he took up quarters for the winter.