Presently the face of the war was changed by the arrival of Imilkon from Carthage. Having been elevated to the chief magistracy of the city, he now brought with him an overwhelming force, collected as well from the subjects in Africa as from Iberia and the Western Mediterranean. It amounted, even in the low estimate of Timæus, to one hundred thousand men, reinforced afterwards in Sicily by thirty thousand more,—and in the more ample computations of Ephorus, to three hundred thousand foot, four thousand horse, four hundred chariots of war, four hundred ships of war, and six hundred transports carrying stores and engines. Dionysius had his spies at Carthage,[1048] even among men of rank and politicians, to apprise him of all movements or public orders. But Imilkon, to obviate knowledge of the precise point in Sicily where he intended to land, gave to the pilots sealed instructions, to be opened only when they were out at sea, indicating Panormus (Palermo) as the place of rendezvous.[1049] The transports made directly for that port, without nearing the land elsewhere; while Imilkon with the ships of war approached the harbor of Motyê and sailed from thence along the coast to Panormus. He probably entertained the hope of intercepting some portion of the Syracusan fleet. But nothing of the kind was found practicable; while Leptines on his side was even fortunate enough to be able to attack, with thirty triremes, the foremost vessels of the large transport-fleet on their voyage to Panormus. He destroyed no less than fifty of them, with five thousand men, and two hundred chariots of war; but the remaining fleet reached the port in safety, and were there joined by Imilkon with the ships of war. The land force being disembarked, the Carthaginian general led them to Motyê, ordering his ships of war to accompany him along the coast. In his way he regained Eryx, which was at heart Carthaginian, having only been intimidated into submission to Dionysius during the preceding year. He then attacked Motyê, which he retook, seemingly after very little resistance. It had held out obstinately against the Syracusans a few months before, while in the hands of its own Carthaginian inhabitants, with their families and properties around them; but the Sikel garrison had far less motive for stout defence.[1050]

Thus was Dionysius deprived of the conquest which had cost him so much blood and toil during the preceding summer. We are surprised to learn that he made no effort to prevent its recapture, though he was then not far off, besieging Egesta,—and though his soldiers, elate with the successes of the preceding year were eager for a general battle. But Dionysius, deeming this measure too adventurous, resolved to retreat to Syracuse. His provisions were failing, and he was at a great distance from allies, so that defeat would have been ruinous. He therefore returned to Syracuse, carrying with him some of the Sikanians, whom he persuaded to evacuate their abode in the Carthaginian neighborhood, promising to provide them with better homes elsewhere. Most of them, however, declined his offers; some (among them, the Halikyæans) preferring to resume their alliance with Carthage. Of the recent acquisitions nothing now remained to Dionysius beyond the Selinuntine boundary; but Gela, Kamarina, Agrigentum, and Selinus had been emancipated from Carthage, and were still in a state of dependent alliance with him; a result of moment,—yet seemingly very inadequate to the immense warlike preparations whereby it had been attained. Whether he exercised a wise discretion in declining to fight the Carthaginians, we have not sufficient information to determine. But his army appear to have been dissatisfied with it, and it was among the causes of the outbreak against him shortly afterwards at Syracuse.[1051]

Thus left master of the country, Imilkon, instead of trying to reconquer Selinus and Himera, which had probably been impoverished by recent misfortunes,—resolved to turn his arms against Messênê in the north-east of the island; a city as yet fresh and untouched,—so little prepared for attack that its walls were not in good repair,—and moreover at the present moment yet farther enfeebled by the absence of its horsemen in the army of Dionysius.[1052] Accordingly, he marched along the northern coast of Sicily, with his fleet coasting in the same direction to coöperate with him. He made terms with Kephalœdium and Therma, captured the island of Lipara, and at length reached Cape Pelôrus, a few miles from Messênê. His rapid march and unexpected arrival struck the Messenians with dismay. Many of them, conceiving defence to be impossible against so numerous a host, sent away their families and their valuable property to Rhegium or elsewhere. On the whole, however, a spirit of greater confidence prevailed, arising in part from an ancient prophecy preserved among the traditions of the town, purporting that the Carthaginians should one day carry water in Messênê. The interpreters affirmed that “to carry water” meant, of course, “to be a slave,”—and the Messenians, persuading themselves that this portended defeat to Imilkon, sent out their chosen military force to meet him at Pelôrus, and oppose his disembarkation. The Carthaginian commander, seeing these troops on their march, ordered his fleet to sail forward into the harbor of the city, and attack it from seaward during the absence of the defenders. A north wind so favored the advance of the ships, that they entered the harbor full sail, and found the city on that side almost unguarded. The troops who had marched out towards Pelôrus hastened back, but were too late;[1053] while Imilkon himself also, pushing forward by land, forced his way into the town over the neglected parts of the wall. Messênê was taken; and its unhappy population fled in all directions for their lives. Some found refuge in the neighboring cities; others ran to the hill-forts of the Messenian territory, planted as a protection against the indigenous Sikels; while about two hundred of them near the harbor, cast themselves into the sea, and undertook the arduous task of swimming across to the Italian coast, in which fifty of them succeeded.[1054]

Though Imilkon tried in vain to carry by assault some of the Messenian hill-forts, which were both strongly placed and gallantly defended,—yet his capture of Messênê itself was an event both imposing and profitable. It deprived Dionysius of an important ally, and lessened his facilities for obtaining succor from Italy. But most of all, it gratified the anti-Hellenic sentiment of the Punic general and his army, counterbalancing the capture of Motyê in the preceding year. Having taken scarce any captives, Imilkon had nothing but unconscious stone and wood upon which to vent his antipathy. He ordered the town, the walls, and all the buildings, to be utterly burnt and demolished; a task which his numerous host are said to have executed so effectually, that there remained hardly anything but ruins, without a trace of human residence.[1055] He received adhesion and reinforcements from most of the Sikels[1056] of the interior, who had been forced to submit to Dionysius a year or two before, but detested his dominion. To some of these Sikels, the Syracusan despot had assigned the territory of the conquered Naxians, with their city probably unwalled. But anxious as they were to escape from him, many had migrated to a point somewhat north of Naxus,—to the hill of Taurus, immediately over the sea, unfavorably celebrated among the Sikel population as being the spot where the first Greek colonists had touched on arriving in the island. Their migration was encouraged, multiplied, and organized, under the auspices of Imilkon, who prevailed upon them to construct, upon the strong eminence of Taurus, a fortified post, which formed the beginning of the city afterwards known as Tauromenium.[1057] Magon was sent with the Carthaginian fleet to assist in the enterprise.

Meanwhile Dionysius, greatly disquieted at the capture of Messênê, exerted himself to put Syracuse in an effective position of defence on her northern frontier. Naxus and Katana being both unfortified, he was forced to abandon them, and he induced the Campanians whom he had planted in Katana to change their quarters to the strong town called Ætna, on the skirt of the mountain so named. He made Leontini his chief position; strengthening as much as possible the fortifications of the city as well as those of the neighboring country forts, wherein he accumulated magazines of provisions from the fertile plains around. He had still a force of thirty thousand foot and more than three thousand horse; he had also a fleet of one hundred and eighty ships of war,—triremes and others. During the year preceding, he had brought out both a land force and a naval force much superior to this, even for purposes of aggression; how it happened that he could now command no more, even for defence and at home,—or what had become of the difference,—we are not told. Of the one hundred and eighty ships of war, sixty only were manned by the extraordinary proceeding of liberating slaves. Such sudden and serious changes in the amount of military force from year to year, are perceptible among Carthaginians as well as Greeks,—indeed throughout most part of Grecian history;—the armies being got together chiefly for special occasions, and then dismissed. Dionysius farther despatched envoys to Sparta, soliciting a reinforcement of a thousand mercenary auxiliaries. Having thus provided the best defence that he could through the territory, he advanced forward with his main land-force to Katana, having his fleet also moving in coöperation, immediately off shore.

Towards this same point of Katana the Carthaginians were now moving, in their march against Syracuse. Magon was directed to coast along with the fleet from Taurus (Tauromenium) to Katana, while Imilkon intended himself to march with the land force on shore, keeping constantly near the fleet for the purpose of mutual support. But his scheme was defeated by a remarkable accident. A sudden eruption took place from Ætna; so that the stream of lava from the mountain to the sea forbade all possibility of marching along the shore to Katana, and constrained him to make a considerable circuit with his army on the land-side of the mountain. Though he accelerated his march as much as possible, yet for two days or more he was unavoidably cut off from the fleet; which under the command of Magon was sailing southward towards Katana. Dionysius availed himself of this circumstance to advance beyond Katana along the beach stretching northward, to meet Magon in his approach, and attack him separately. The Carthaginian fleet was much superior in number, consisting of five hundred sail in all; a portion of which, however, were not strictly ships of war, but armed merchantmen,—that is, furnished with brazen bows for impact against an enemy, and rowed with oars. But on the other hand, Dionysius had a land-force close at hand to coöperate with his fleet; an advantage which in ancient naval warfare counted for much, serving in case of defeat as a refuge to the ships, and in case of victory as intercepting or abridging the enemy’s means of escape. Magon, alarmed when he came in sight of the Grecian land-force mustered on the beach, and the Grecian fleet rowing up to attack him,—was nevertheless constrained unwillingly to accept the battle. Leptines, the Syracusan admiral,—though ordered by Dionysius to concentrate his ships as much as possible, in consequence of his inferior numbers,—attacked with boldness, and even with temerity; advancing himself with thirty ships greatly before the rest, and being apparently farther out to sea than the enemy. His bravery at first appeared successful, destroying or damaging the headmost ships of the enemy. But their superior numbers presently closed around him, and after a desperate combat, fought in the closest manner, ship to ship and hand to hand, he was forced to sheer off, and to seek escape seaward. His main fleet, coming up in disorder, and witnessing his defeat, were beaten also, after a strenuous contest. All of them fled, either landward or seaward as they could, under vigorous pursuit by the Carthaginian vessels; and in the end, no less than a hundred of the Syracusan ships, with twenty thousand men, were numbered as taken, or destroyed. Many of the crews, swimming or floating in the water on spars, strove to get to land to the protection of their comrades. But the Carthaginian small craft, sailing very near to the shore, slew or drowned these unfortunate men, even under the eyes of friends ashore who could render no assistance. The neighboring water became strewed, both with dead bodies and with fragments of broken ships. As victors, the Carthaginians were enabled to save many of their own seamen, either on board of damaged ships, or swimming for their lives. Yet their own loss too was severe; and their victory, complete as it proved, was dearly purchased.

Though the land-force of Dionysius had not been at all engaged, yet the awful defeat of his fleet induced him to give immediate orders for retreating, first to Katana and afterwards yet farther to Syracuse. As soon as the Syracusan army had evacuated the adjoining shore, Magon towed all his prizes to land, and there hauled them up on the beach; partly for repair, wherever practicable,—partly as visible proofs of the magnitude of the triumph, for encouragement to his own armament. Stormy weather just then supervening, he was forced to haul his own ships ashore also for safety, and remained there for several days refreshing the crews. To keep the sea under such weather would have been scarcely practicable; so that if Dionysius, instead of retreating, had continued to occupy the shore with his unimpaired land-force, it appears that the Carthaginian ships would have been in the greatest danger; constrained either to face the storm, to run back a considerable distance northward, or to make good their landing against a formidable enemy, without being able to wait for the arrival of Imilkon.[1058] The latter, after no very long interval, came up, so that the land-force and the navy of the Carthaginians were now again in coöperation. While allowing his troops some days of repose and enjoyment of the victory, he sent envoys to the town of Ætna, inviting the Campanian mercenary soldiers to break with Dionysius and join him. Reminding them that their countrymen at Entella were living in satisfaction as a dependency of Carthage (which they had recently testified by resisting the Syracusan invasion), he promised to them an accession of territory, and a share in the spoils of the war, to be wrested from Greeks who were enemies of Campanians not less than of Carthaginians.[1059] The Campanians of Ætna would gladly have complied with his invitation, and were only restrained from joining him by the circumstance that they had given hostages to the despot of Syracuse, in whose army also their best soldiers were now serving.

Meanwhile Dionysius, in marching back to Syracuse, found his army grievously discontented. Withdrawn from the scene of action without even using their arms, they looked forward to nothing better than a blockade at Syracuse, full of hardship and privation. Accordingly many of them protested against retreat, conjuring him to lead them again to the scene of action, that they might either assail the Carthaginian fleet in the confusion of landing, or join battle with the advancing land-force under Imilkon. At first, Dionysius consented to such change of scheme. But he was presently reminded that unless he hastened back to Syracuse, Magon with the victorious fleet might sail thither, enter the harbor, and possess himself of the city; in the same manner as Imilkon had recently succeeded at Messênê. Under these apprehensions he renewed his original order for retreat, in spite of the vehement protest of his Sicilian allies; who were indeed so incensed that most of them quitted him at once. Which of the two was the wiser plan, we have no sufficient means to determine. But the circumstances seem not to have been the same as those preceding the capture of Messênê; for Magon was not in a condition to move forward at once with the fleet, partly from his loss in the recent action, partly from the stormy weather; and might perhaps have been intercepted in the very act of landing, if Dionysius had moved rapidly back to the shore. As far as we can judge, it would appear that the complaints of the army against the hasty retreat of Dionysius rested on highly plausible grounds. He nevertheless persisted, and reached Syracuse with his army not only much discouraged, but greatly diminished by the desertion of allies. He lost no time in sending forth envoys to the Italian Greeks and to Peloponnesus, with ample funds for engaging soldiers, and urgent supplications to Sparta as well as to Corinth.[1060] Polyxenus, his brother-in-law, employed on this mission, discharged his duty with such diligence, that he came back in a comparatively short space of time, with thirty-two ships of war under the command of the Lacedæmonian Pharakidas.[1061]

Meanwhile Imilkon, having sufficiently refreshed his troops after the naval victory off Katana, moved forward towards Syracuse both with the fleet and the land-force. The entry of his fleet into the Great Harbor was ostentatious and imposing; far above even that of the second Athenian armament, when Demosthenes first exhibited its brilliant but short-lived force.[1062] Two hundred and eight ships of war first rowed in, marshalled in the best order, and adorned with the spoils of the captured Syracusan ships. These were followed by transports, five hundred of them carrying soldiers, and one thousand others either empty or bringing stores and machines. The total number of vessels, we are told, reached almost two thousand, covering a large portion of the Great Harbor.[1063] The numerous land-force marched up about the same time; Imilkon establishing his head quarters in the temple of Zeus Olympius, nearly one English mile and a half from the city. He presently drew up his forces in order of battle, and advanced nearly to the city walls; while his ships of war also, being divided into two fleets of one hundred ships each, showed themselves in face of the two interior harbors or docks (on each side of the connecting strait between Ortygia and the main land) wherein the Syracusan ships were safely lodged. He thus challenged the Syracusans to combat on both elements; but neither challenge was accepted.

Having by such defiance farther raised the confidence of his own troops, he first spread them over the Syracusan territory, and allowed them for thirty days to enrich themselves by unlimited plunder. Next, he proceeded to establish fortified posts, as essential to the prosecution of a blockade which he foresaw would be tedious. Besides fortifying the temple of the Olympian Zeus, he constructed two other forts; one at Cape Plemmyrium (on the southern entrance of the harbor, immediately opposite to Ortygia, where Nikias had erected a post also), the other on the Great Harbor, midway between Plemmyrium and the temple of the Olympian Zeus, at the little bay called Daskon. He farther encircled his whole camp, near the last-mentioned temple, with a wall; the materials of which were derived in part from the demolition of the numerous tombs around; especially one tomb, spacious and magnificent, commemorating Gelon and his wife Damaretê. In these various fortified posts he was able to store up the bread, wine, and other provisions which his transports were employed in procuring from Africa and Sardinia, for the continuous subsistence of so mighty an host.