There they ordered the troops from the fortresses on the Po to join them, probably by water, and awaited the commencement of the favourable season, when they proposed to occupy in the defensive the passes of the Apennines, and then, taking up the offensive, to descend into the valley of the Po and effect a junction somewhere near Placentia.

But Hannibal by no means intended to defend the valley of the Po.

He knew Rome better perhaps than the Romans knew it themselves, and was very well aware how decidedly he was the weaker and continued to be so notwithstanding the brilliant battle on the Trebia; he knew too that his ultimate object, the humiliation of Rome, was not to be wrung from the unbending Roman pride either by terror or by surprise, but could only be gained by the actual subjugation of the haughty city.

It was clearly apparent that the Italian federation was in political solidity and in military resources infinitely superior to an adversary, who received only precarious and irregular support from home, and who in Italy was dependent for primary aid solely on the vacillating and capricious nation of the Celts; and that the Phoenician foot soldier was, notwithstanding all the pains taken by Hannibal, far inferior in point of tactics to the legionary, had been completely proved by the defensive movements of Scipio and the brilliant retreat of the defeated infantry on the Trebia.

From this conviction flowed the two fundamental principles which determined Hannibal's whole method of operations in Italy--viz., that the war should be carried on, in somewhat adventurous fashion, with constant changes in the plan and in the theatre of operations; and that its favourable issue could only be looked for as the result of political and not of military successes--of the gradual loosening and final breaking up of the Italian federation.