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
The arrangement was however still worse, by which
the chief command of the fleet was treated as an appanage to the chief
command of the land army, and any one who chanced to be president of
the city thought himself able to act the part not of general only, but
of admiral too. The worst disasters which Rome suffered in this war
were due not to the storms and still less to the Carthaginians, but
to the presumptuous folly of its own citizen-admirals.
Rome was victorious at last. But her acquiescence in a gain far less
than had at first been demanded and indeed offered, as well as the
energetic opposition which the peace encountered in Rome, very clearly
indicate the indecisive and superficial character of the victory and
of the peace; and if Rome was the victor, she was indebted for her
victory in part no doubt to the favour of the gods and to the energy
of her citizens, but still more to the errors of her enemies in the
conduct of the war--errors far surpassing even her own.