Concurrently with the great struggle in Italy the Second Punic War was fought out on several other fields. The First Macedonian War (215–205) broke out when King Philip V pressed his ambitions in Illyria after he perceived a weakening of Roman power in the wake of Cannae. This compelled the Romans to stretch their already severely strained resources still further by sending troops to Greece. For a time, Roman diplomacy checked Philip’s actions in Greece and the maintenance of a patrol squadron in the Adriatic Sea prevented any effective cooperation between Philip and Hannibal.

In view of the complete stagnation of agriculture in Italy the Romans had to look to Sardinia and Sicily for their food supply. Sardinia was attacked by Carthaginians in 215, but a small Roman force sufficed to repel the invasion. In Sicily a more serious conflict broke out. Some isolated attacks by Punic squadrons were easily frustrated by the strong Roman fleet. But in 215 internal complications arose. The death of Hieron II, Rome’s steadfast friend, left the kingdom of Syracuse to his inexperienced grandson Hieronymus. Flattered by the promises of Carthaginian emissaries, the young prince abruptly broke with the Romans, but before hostilities commenced he was assassinated. The Syracusan people now repudiated the monarchy and resumed their republican constitution, but, misled by false threats of terrible punishment at the hands of Rome, they were played into the hands of the Carthaginians.

The attacks of a Roman army and fleet under Marcellus which appeared before the town were completely baffled by the mechanical contrivances of the Syracusan mathematician Archimedes (213). Meantime, the revolt against Rome spread in the interior, and a Carthaginian fleet gained control of towns on the south coast. In 212 Marcellus at last broke through the defense of Syracuse and in spite of the arrival of a Carthaginian relief force mastered the whole town by spring 211. A guerrilla warfare campaign followed in which the Carthaginians maintained the upper hand until in 210 they lost their base at Agrigentum. They were dislodged from their remaining positions, and by the end of the year Sicily was wholly under the power of Rome.

The conflict in Spain was second in importance to the Italian war alone. From this country the Carthaginians drew large supplies of troops and money which might serve to reinforce Hannibal; hence it was in the interest of the Romans to challenge their enemy within Spain. Though the force which Rome at first spared for this war was small in numbers and rested entirely upon its own resources, the generals Publius Cornelius Scipio and Gnaeus Cornelius Scipio Calvus were among Rome’s most capable commanders. By skillful strategy and diplomacy the Scipio brothers not only won over the peoples north of the Ebro and defeated the Carthaginian leader Hasdrubal Barca in his attempts to restore communication with Italy, but they also carried their arms along the east coast into the heart of the enemy’s domain.

Eventually the Scipios’ successes were nullified by a rash advance. Deserted by their native contingents and cut off by Carthaginian cavalry, among which the Numidian prince Masinissa rendered conspicuous service, the Roman generals were killed and their troops destroyed (211). Nevertheless, the Spanish campaign prevented the reinforcement of Hannibal’s main army in Italy and occupied vital Carthaginian resources.

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Disturbances in Africa prevented the Punic commanders from exploiting their success. Before long the fall of Capua enabled Rome to transfer troops from Italy to Spain, and in 210 the best Roman general of the day, the young son and namesake of Publius Cornelius Scipio, was placed in command. He signalized his arrival by a bold and successful coup de main upon the great arsenal of Carthago Nova (Cartagena) in 209. Though after an engagement at Baecula (Bailen) in 208 he was unable to prevent Hasdrubal Barca from marching away to Italy, Scipio (later known as Scipio Africanus) profited by his departure to push back the remaining hostile forces the more rapidly. A last effort by the Carthaginians to retrieve their losses with a fresh army was frustrated by a great victory at Ilipa, near Seville. By the end of the year 206 they had been driven out of Spain.

The war in Africa

In 205 Scipio, who had returned to Rome to hold the consulship, proposed to follow up his victories by an attack upon the home territory of Carthage. Though the presence of Hannibal in Italy deterred Fabius and other senators from sanctioning this policy, Scipio gradually overbore all resistance. He built up a force which he organized and supplemented in Sicily, and in 204 sailed across to Africa. He was there met by a combined levy of Carthage and King Syphax of Numidia, and for a time was penned to the shore near Utica. In the winter he extricated himself by a surprise attack upon the enemy’s camp, which resulted in the total loss of the allied force by sword or fire.

In the campaign of 203 a new Carthaginian force was destroyed by Scipio on the plains 75 miles (about 120 km) from Utica. Carthage’s ally Syphax was captured, and the renegade Masinissa reinstated in the kingdom from which Syphax had recently expelled him. These disasters induced the Carthaginians to sue for peace, but before the very moderate terms which Scipio offered could be definitely accepted, a sudden reversal of opinion caused them to break off negotiations and recall Hannibal’s army for a final trial of war. In 202 Hannibal assumed command of a composite force of citizen and mercenary levies stiffened with a corps of his veteran Italian troops.

After an abortive conference with Scipio, Hannibal prepared for a decisive battle at Zama. Scipio’s force was somewhat smaller in numbers but well trained throughout, and his cavalry, under Masinissa and Gaius Laelius, was vastly superior. His infantry, after evading an attack by the Carthaginian elephants, cut through the first two lines of the enemy but was unable to break the reserve corps of Hannibal’s veterans. The battle was ultimately decided by the cavalry of the Romans and their new ally Masinissa, which—by a maneuver recalling the tactics of Cannae—took Hannibal’s line in the rear and completely destroyed it. The Carthaginians having thus lost their last army again applied for peace and accepted the terms which Scipio offered. They were compelled to cede Spain and the Mediterranean islands still in their hands, to surrender their warships, to pay an indemnity of 10,000 talents within 50 years, and to forfeit their independence in affairs of war and foreign policy.

The Second Punic War, by far the greatest struggle in which either power had engaged, thus ended in the complete triumph of Rome. This is not to be explained in the main by any faultiness in the Carthaginians’ method of attack. The history of the First Punic War, and that of the Second outside of Italy, prove that the Romans were superior on neutral or Carthaginian ground. Carthage could only hope to win by invading Italy and using the enemy’s home resources against it. The failure of Hannibal’s brilliant endeavour to realize these conditions was not due to any strategic mistakes on his part. It was caused by the indomitable strength of will of the Romans, whose character during this period appears at its best, and to the compactness of their Italian confederacy, which no shock of defeat or strain of war could entirely disintegrate. It is this spectacle of individual genius overborne by corporate and persevering effort which lends to the Second Punic War its peculiar interest.