So far as the Romans were concerned, they were essentially defensive wars, the proper objects of which were to hold the passes of the Pyrenees, to detain the Macedonian army in Greece, to defend Messana and to bar the communication between Italy and Sicily.

Of course this defensive warfare was, wherever it was possible, waged by offensive methods; and, should circumstances be favourable, it might develop into the dislodging of the Phoenicians from Spain and Sicily, and into the dissolution of Hannibal's alliances with Syracuse and with Philip.

The Italian war in itself fell for the time being into the shade, and resolved itself into conflicts about fortresses and razzias, which had no decisive effect on the main issue.

Nevertheless, so long as the Phoenicians retained the offensive at all, Italy always remained the central aim of operations; and all efforts were directed towards, as all interest centred in, the doing away, or perpetuating, of Hannibal's isolation in southern Italy.
The Sending of Reinforcements Temporarily Frustrated Had it been possible, immediately after the battle of Cannae, to bring into play all the resources on which Hannibal thought that he might reckon, he might have been tolerably certain of success.

But the position of Hasdrubal at that time in Spain after the battle on the Ebro was so critical, that the supplies of money and men, which the victory of Cannae had roused the Carthaginian citizens to furnish, were for the most part expended on Spain, without producing much improvement in the position of affairs there.