The Roman state was in a plight, such as may occur even in firmly-established and sagacious aristocracies. The Romans knew doubtless what they wished to accomplish, and they took various steps; but nothing was done rightly or at the right time. They might long ago have been masters of the gates of the Alps and have settled matters with the Celts; the latter were still formidable, and the former were open. They might either have had friendship, with Carthage, had they honourably kept the peace of 513, or, had they not been disposed for peace, they might long ago have conquered Cartilage: the peace was practically broken by the seizure of Sardinia, and they allowed the power of Carthage to recover itself undisturbed for twenty years. There was no great difficulty in maintaining peace with Macedonia; but they had forfeited her friendship for a trifling gain. There must have been a lack of some leading statesman to take a connected and commanding view of the position of affairs; on all hands either too little was done, or too much. Now the war began at a time and at a place which they had allowed the enemy to determine; and, with all their well-founded conviction of military superiority, they were perplexed as to the object to be aimed at and the course to be followed in their first operations. They had at their disposal more than half a million of serviceable soldiers; the Roman cavalry alone was less good, and relatively less numerous, than the Carthaginian, the former constituting about a tenth, the latter an eighth, of the whole number of troops taking the field. None of the states affected by the war had any fleet corresponding to the Roman fleet of 220 quinqueremes, which had just returned from the Adriatic to the western sea. The natural and proper application of this crushing superiority of force was self-evident. It had been long settled that the war ought to be opened with a landing in Africa. The subsequent turn taken by events had compelled the Romans to embrace in their scheme of the war a simultaneous landing in Spain, chiefly to prevent the Spanish army from appearing before the walls of Carthage. In accordance with this plan they ought above all, when the war had been practically opened by Hannibal's attack on Saguntum in the beginning of 535, to have thrown a Roman army into Spain before the town fell; but they neglected the dictates of interest no less than of honour. For eight months Saguntum held out in vain: when the town passed into other hands, Rome had not even equipped her armament for landing in Spain. The country, however, between the Ebro and the Pyrenees was still free, and its tribes were not only the natural allies of the Romans, but had also, like the Saguntines, received from Roman emissaries promises of speedy assistance. Catalonia may be reached by sea from Italy in not much longer time than from Cartagena by and: had the Romans started, like the Phoenicians, in April, after the formal declaration of war that had taken place in the interval, Hannibal might have encountered the Roman legions on the line of the Ebro.

At length, certainly, the greater part of the army and of the fleet was got ready for the expedition to Africa, and the second consul Publius Cornelius Scipio was ordered to the Ebro; but he took time, and when an insurrection broke out on the Po, he allowed the army that was ready for embarkation to be employed there, and formed new legions for the Spanish expedition. So although Hannibal encountered on the Ebro very vehement resistance, it proceeded only from the natives; and, as under existing circumstances time was still more precious to him than the blood of his men, he surmounted the opposition after some months with the loss of a fourth part of his army, and reached the line of the Pyrenees. That the Spanish allies of Rome would be sacrificed a second time by that delay might have been as certainly foreseen, as the delay itself might have been easily avoided; but probably even the expedition to Italy itself, which in the spring of 536 must not have been anticipated in Rome, would have been averted by the timely appearance of the Romans in Spain. Hannibal had by no means the intention of sacrificing his Spanish "kingdom", and throwing himself like a desperado on Italy. The time which he had spent in the siege of Saguntum and in the reduction of Catalonia, and the considerable corps which he left behind for the occupation of the newly-won territory between the Ebro and the Pyrenees, sufficiently show that, had a Roman army disputed the possession of Spain with him, he would not have been content to withdraw from it; and - which was the main point - had the Romans been able to delay his departure from Spain for but a few weeks, winter would have closed the passes of the Alps before Hannibal reached them, and the African expedition would have departed without hindrance for its destination.

Arrived at the Pyrenees, Hannibal sent home a portion of his troops; a measure which he had resolved on from the first with the view of showing to the soldiers how confident their general was of success, and of checking the feeling that his enterprise was one of those from which there is no return home. With an army of 50,000 infantry and 9000 cavalry, entirely veteran soldiers, he crossed the Pyrenees without difficulty, and then took the coast route by Narbonne and Nimes through the Celtic territory, which was opened to the army partly by the connections previously formed, partly by Carthaginian gold, partly by arms. It was not till it arrived in the end of July at the Rhone opposite Avignon, that a serious resistance appeared to await it. The consul Scipio, who on his voyage to Spain had landed at Massilia (about the end of June), had there been informed that he had come too late and that Hannibal had crossed not only the Ebro but the Pyrenees. On receiving these accounts, which appear to have first opened the eyes of the Romans to the course and the object of Hannibal, the consul had temporarily given up his expedition to Spain, and had resolved in connection with the Celtic tribes of that region, who were under the influence of the Massiliots and thereby under that of Rome, to receive the Phoenicians on the Rhone, and to obstruct their passage of the river and their march into Italy. Fortunately for Hannibal, opposite to the point at which he meant to cross, there lay at the moment only the general levy of the Celts, while the consul himself with his army of 22,000 infantry and 2000 horse was still in Massilia, four days' march farther down the stream. The messengers of the Gallic levy hastened to inform him. It was the object of Hannibal to convey his army with its numerous cavalry and elephants across the rapid stream under the eyes of the enemy, and before the arrival of Scipio; and he possessed not a single boat. Immediately by his directions all the boats belonging to the numerous navigators of the Rhone in the neighbourhood were bought up at any price, and the deficiency of boats was supplied by rafts made from felled trees; and in fact the whole numerous army could be conveyed over in one day. While this was being done, a strong division under Hanno, son of Bomilcar, proceeded by forced marches up the stream till they reached a suitable point for crossing, which they found undefended, situated two short days' march above Avignon. Here they crossed the river on hastily constructed rafts, with the view of then moving down on the left bank and taking the Gauls, who were barring the passage of the main army, in the rear. On the morning of the fifth day after they had reached the Rhone, and of the third after Hanno's departure, the smoke-signals of the division that had been detached rose up on the opposite bank and gave to Hannibal the anxiously awaited summons for the crossing. Just as the Gauls, seeing that the enemy's fleet of boats began to move, were hastening to occupy the bank, their camp behind them suddenly burst into flames. Surprised and divided, they were unable either to withstand the attack or to resist the passage, and they dispersed in hasty flight.