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
This objection
was very probably groundless; Marius showed at least his bodily
vigour by appearing daily in the circus at Rome, and even as
commander-in-chief he seems to have displayed on the whole his old
ability in the last campaign; but he had not achieved the brilliant
successes by which alone after his political bankruptcy he could have
rehabilitated himself in public opinion, and so the celebrated champion
was to his bitter vexation now, even as an officer, unceremoniously laid
aside as useless.
The place of Marius in the Marsian army was taken
by the consul of this year, Lucius Porcius Cato, who had fought with
distinction in Etruria, and that of Caesar in the Campanian army by
his lieutenant, Lucius Sulla, to whom were due some of the most
material successes of the previous campaign; Gnaeus Strabo retained--
now as consul--the command which he had held so successfully in
the Picenian territory.