The Histories of Polybius (Vol.1&2). Polybius
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Megalopolis having fallen, then, Antigonus spent the winter at Argos. But at the approach of spring Cleomenes collected his army, addressed a suitable exhortation to them, and led them into the Argive territory. Most people thought this a hazardous and foolhardy step, because the places at which the frontier was crossed were strongly fortified; but those who were capable of judging regarded the measure as at once safe and prudent. For seeing that Antigonus had dismissed his forces, he reckoned on two things,—there would be no one to resist him, and therefore he would run no risk; and when the Argives found that their territory was being laid waste up to their walls, they would be certain to be roused to anger and to lay the blame upon Antigonus: therefore, if on the one hand Antigonus, unable to bear the complaints of the populace, were to sally forth and give him battle with his present forces, Cleomenes felt sure of an easy victory; but if on the other hand Antigonus refused to alter his plans, and kept persistently aloof, he believed that he would be able to effect a safe retreat home, after succeeding by this expedition in terrifying his enemies and inspiring his own forces with courage. And this was the actual result. For as the devastation of the country went on, crowds began to collect and abuse Antigonus: but like a wise general and king, he refused to allow any consideration to outweigh that of sound strategy, and persisted in remaining inactive. Accordingly Cleomenes, in pursuance of his plan, having terrified his enemies and inspired courage in his own army for the coming struggle, returned home unmolested.
The summer campaign. The army of Antigonus.
65. Summer having now come, and the Macedonian and Achaean soldiers having assembled from their winter quarters, Antigonus moved his army, along with his allies, into Laconia. The main force consisted of ten thousand Macedonians for the phalanx, three thousand light armed, and three hundred cavalry. With these were a thousand Agraei; the same number of Gauls; three thousand mercenary infantry, and three hundred cavalry; picked troops of the Achaeans, three thousand infantry and three hundred cavalry; and a thousand Megalopolitans armed in the Macedonian manner, under the command of Cercidas of Megalopolis. Of the allies there were two thousand infantry, and two hundred cavalry, from Boeotia; a thousand infantry and fifty cavalry from Epirus; the same number from Acarnania; and sixteen hundred from Illyria, under the command of Demetrius of Pharos. The whole amounted to twenty-eight thousand infantry and twelve hundred cavalry.
The position of Cleomenes at Sellasia.
Cleomenes had expected the attack, and had secured the passes into the country by posting garrisons, digging trenches, and felling trees; while he took up position at a place called Sellasia, with an army amounting to twenty thousand, having calculated that the invading forces would take that direction: which turned out to be the case. This pass lies between two hills, called respectively Evas and Olympus, and the road to Sparta follows the course of the river Oenus. Cleomenes strengthened both these hills by lines of fortification, consisting of trench and palisade. On Evas he posted the perioeci and allies, under the command of his brother Eucleidas; while he himself held Olympus with the Lacedaemonians and mercenaries. On the level ground along the river he stationed his cavalry, with a division of his mercenaries, on both sides of the road. When Antigonus arrived, he saw at once the strength of the position, and the skill with which Cleomenes had selected the different branches of his army to occupy the points of vantage, so that the whole aspect of the position was like that of skilled soldiers drawn up ready for a charge. For no preparation for attack or defence had been omitted; but everything was in order, either for offering battle with effect, or for holding an almost unassailable position.
66. The sight of these preparations decided Antigonus not to make an immediate attack upon the position, or rashly hazard an engagement. He pitched his camp a short distance from it, covering his front by the stream called Gorgylus, and there remained for some days; informing himself by reconnaissances of the peculiarities of the ground and the character of the troops, and at the same time endeavouring by feigned movements to elicit the intentions of the enemy. But he could never find an unguarded point, or one where the troops were not entirely on the alert, for Cleomenes was always ready at a moment’s notice to be at any point that was attacked. He therefore gave up all thoughts of attacking the position; and finally an understanding was come to between him and Cleomenes to bring the matter to the decision of battle. And, indeed, Fortune had there brought into competition two commanders equally endowed by nature with military skill. To face the division of the enemy on Evas Antigonus stationed his Macedonian hoplites with brazen shields, and the Illyrians, drawn up in alternate lines, under the command of Alexander, son of Acmetus, and Demetrius of Pharos, respectively. Behind them he placed the Acarnanians and Cretans, and behind them again were two thousand Achaeans to act as a reserve. His cavalry, on the banks of the river Oenous, were posted opposite the enemy’s cavalry, under the command of Alexander, and flanked by a thousand Achaean infantry and the same number of Megalopolitans. Antigonus himself determined to lead his mercenaries and Macedonian troops in person against the division on Olympus commanded by Cleomenes. Owing to the narrowness of the ground, the Macedonians were arranged in a double phalanx, one close behind the other, while the mercenaries were placed in front of them. It was arranged that the Illyrians, who had bivouacked in full order during the previous night along the river Gorgylus, close to the foot of Evas, were to begin their assault on the hill when they saw a flag of linen raised from the direction of Olympus; and that the Megalopolitans and cavalry should do the same when the king raised a scarlet flag.
Battle of Sellasia.
67. The moment for beginning the battle had come: the signal was given to the Illyrians, and the word passed by the officers to their men to do their duty, and in a moment they started into view of the enemy and began assaulting the hill. But the light-armed troops who were stationed with Cleomenes’s cavalry, observing that the Achaean lines were not covered by any other troops behind them, charged them on the rear; and thus reduced the division while endeavouring to carry the hill of Evas to a state of great peril,—being met as they were on their front by Eucleidas from the top of the hill, and being charged and vigorously attacked by the light-armed mercenaries on their rear.
Philopoemen’s presence of mind.
It was at this point that Philopoemen of Megalopolis, with a clear understanding of the situation and a foresight of what would happen, vainly endeavoured to point out the certain result to his superior officers. They disregarded him for his want of experience in command and his extreme youth; and, accordingly he acted for himself, and cheering on the men of his own city, made a vigorous charge on the enemy. This effected a diversion; for the light-armed mercenaries, who were engaged in harassing the rear of the party ascending Evas, hearing the shouting and seeing the cavalry engaged, abandoned their attack upon this party and hurried back to their original position to render assistance to the cavalry. The result was that the division of Illyrians, Macedonians, and the rest who were advancing with them, no longer had their attention diverted by an attack upon their rear, and so continued their advance upon the enemy with high spirits and renewed confidence. And this afterwards caused it to be acknowledged that to Philopoemen was due the honour of the success against Eucleidas.
68. It is clear that Antigonus at any rate entertained that opinion, for after the battle he asked Alexander, the commander of the cavalry, with the view of convicting him of his shortcoming, “Why he had engaged before the signal was given?” And upon Alexander answering that “He had not done so, but that a young officer from Megalopolis had presumed to anticipate the signal, contrary to his wish:” Antigonus replied, “That young man acted like a good general in grasping the situation; you, general, were the youngster.”
Defeat of Eucleidas.
What Eucleidas ought to have done, when he saw the enemy’s lines advancing, was to have rushed down at once upon them; thrown their ranks into disorder; and then retired himself, step by step, to continually higher ground into a safe position: for by thus breaking them up and depriving them, to begin with, of the advantages of their peculiar armour and disposition, he would have secured the victory by the superiority of his position. But he did the very opposite of all this, and thereby forfeited the advantages of the ground. As though victory were assured, he kept his original position on the summit of the hill, with the view of catching the enemy at as great an elevation as possible, that their flight might be all the longer over steep and precipitous ground. The result, as might have