When the isthmian fortifications were completed, the superstition of the regent Cleombrotus, who had superintended their construction, was alarmed by an eclipse, and he led back to Sparta the detachment he had commanded in that quarter. He returned but to die; and his son Pausanias succeeded to the regency during the continued minority of Pleistarchus, the infant heir of Leonidas [97]. If the funeral solemnities on the death of a regent were similar to those bestowed upon a deceased king, we can account at once for the delay of the ephors, since the ten days which passed without reply to the ambassadors exactly correspond in number with the ten days dedicated to public mourning. [98] But whatever the cause of the Spartan delay —and the rigid closeness of that oligarchic government kept, in yet more important matters, its motives and its policy no less a secret to contemporaneous nations than to modern inquirers—the delay itself highly incensed the Athenian envoys: they even threatened to treat with Mardonius, and abandon Sparta to her fate, and at length fixed the day of their departure. The ephors roused themselves. Among the deputies from the various states, there was then in Sparta that Chileus of Tegea, who had been scarcely less serviceable than Themistocles in managing the affairs of Greece in the isthmian congress. This able and eminent Arcadian forcibly represented to the ephors the danger of forfeiting the Athenian alliance, and the insufficient resistance against the Persian that the fortifications of the isthmus would afford. The ephors heard, and immediately acted with the secrecy and the vigilance that belongs to oligarchies. That very night they privately despatched a body of five thousand Spartans and thirty-five thousand helots (seven to each Spartan), under the command of Pausanias.

The next morning the ephors calmly replied to the angry threats of the Athenians, by protesting that their troops were already on the march, and by this time in Oresteum, a town in Arcadia, about eighteen miles distant from Sparta. The astonished deputies [99] hastened to overtake the Spartan force, and the ephors, as if fully to atone for their past procrastination, gave them the escort and additional re-enforcement of five thousand heavy-armed Laconians or Perioeci.

VI. Mardonius soon learned from the Argives (who, not content with refusing to join the Greek legion, had held secret communications with the Persians) of the departure of the Spartan troops. Hitherto he had refrained from any outrage on the Athenian lands and city, in the hope that Athens might yet make peace with him. He now set fire to Athens, razed the principal part of what yet remained of the walls and temples [100], and deeming the soil of Attica ill adapted to his cavalry, and, from the narrowness of its outlets, disadvantageous in case of retreat, after a brief incursion into Megara he retired towards Thebes, and pitched his tents on the banks of the Asopus, extending from Erythrae to Plataea. Here his force was swelled by such of the Greeks as were friendly to his cause.

VII. Meanwhile the Spartans were joined at the isthmus by the rest of the Peloponnesian allies. Solemn sacrifices were ordained, and the auguries drawn from the victims being favourable, the Greek army proceeded onward; and, joined at Eleusis by the Athenians, marched to the foot of Cithaeron, and encamped opposite the Persians, with the river of the Asopus between the armies. Aristides commanded the Athenians, at the head of eight thousand foot; and while the armies were thus situated, a dangerous conspiracy was detected and defeated by that able general.

The disasters of the war—the devastation of lands, the burning of houses—had reduced the fortunes of many of the Athenian nobles. With their property diminished their influence. Poverty, and discontent, and jealousy of new families rising into repute [101], induced these men of fallen fortunes to conspire for the abolition of the popular government at Athens, and, failing that attempt, to betray the cause to the enemy.

This project spread secretly through the camp, and corrupted numbers; the danger became imminent. On the one hand, the conspiracy was not to be neglected; and, on the other, in such a crisis it might be dangerous too narrowly to sift a design in which men of mark and station were concerned. Aristides acted with a singular prudence. He arrested eight of the leaders. Of these he prosecuted only two (who escaped during the proceedings), and, dismissing the rest, appealed to the impending battle as the great tribunal which would acquit them of the charge and prove their loyalty to the state. [102]

VIII. Scarce was this conspiracy quelled than the cavalry of the Persians commenced their operations. At the head of that skilful and gallant horse, for which the oriental nations are yet renowned, rode their chief, Masistius, clad in complete armour of gold, of brass, and of iron, and noted for the strength of his person and the splendour of his trappings. Placed on the rugged declivities of Cithaeron, the Greeks were tolerably safe from the Persian cavalry, save only the Megarians, who, to the number of three thousand, were posted along the plain, and were on all sides charged by that agile and vapid cavalry. Thus pressed, the Megarians sent to Pausanias for assistance. The Spartan beheld the air darkened with shafts and arrows, and knew that his heavy-armed warriors were ill adapted to act against horse. He in vain endeavoured to arouse those about him by appeals to their honour —all declined the succour of the Megarians—when Aristides, causing the Athenian to eclipse the Spartan chivalry, undertook the defence. With three hundred infantry, mixed with archers, Olympiodorus, one of the ablest of the Athenian officers, advanced eagerly on the barbarian.

Masistius himself, at the head of his troops, spurred his Nisaean charger against the new enemy. A sharp and obstinate conflict ensued; when the horse of the Persian general, being wounded, threw its rider, who could not regain his feet from the weight of his armour. There, as he lay on the ground, with a swarm of foes around him, the close scales of his mail protected him from their weapons, until at length a lance pierced the brain through an opening in his visor. After an obstinate conflict for his corpse, the Persians were beaten back to the camp, where the death of one, second only to Mardonius in authority and repute, spread universal lamentation and dismay.

The body of Masistius, which, by its vast size and beautiful proportions, excited the admiration of the victors, remained the prize of the Greeks; and, placed on a bier, it was borne triumphantly through the ranks.

IX. After this victory, Pausanias conducted his forces along the base of Cithaeron into the neighbourhood of Plataea, which he deemed a more convenient site for the disposition of his army and the supply of water. There, near the fountain of Gargaphia [103], one of the sources of the Asopus (which splits into many rivulets, bearing a common name), and renowned in song for the death of the fabulous Actaeon, nor far from the shrine of an old Plataean hero (Androcrates), the Greeks were marshalled in regular divisions, the different nations, some on a gentle acclivity, others along the plain.