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.