XI. He was elected general with unlimited powers, and proceeded to Platæa with eight thousand Athenians. Here he was met by Pausanias, the commander-in-chief of the Greek forces, with the Spartan contingent, and the rest of the Greek troops joined them there. The Persian army was encamped along the course of the river Asopus. On account of its enormous size it was not contained in a fortified camp, but a quadrangular wall was constructed round the baggage and most valuable material. Each side of this square was ten furlongs in length. Tisamenus of Elis, the prophet, now told Pausanias and all the Greeks that they would win the victory if they stood on the defensive and did not attack. Aristeides sent to Delphi, and received a response from the oracle, that the Athenians would conquer if they prayed to Zeus, to Hera of Kithæron, and to Pan and the nymphs Sphragitides, and if they sacrificed to the heroes Androkrates, Leukon, Peisander, Damokrates, Hypsion, Aktaion, and Polyïdus, and if they would fight in their own territory, in the plain of Demeter of Eleusis and her daughter. This oracle greatly disturbed Aristeides. The heroes to whom he was bidden to sacrifice are the original founders of the city of Platæa, and the cave of the nymphs called Sphragitides, is on one of the peaks of Kithæron, looking towards the point where the sun sets in summer. It is said that there was formerly an oracle there, and that many of the people became possessed, and were called "nympholeptæ." But as to the plain of the Eleusinian Demeter, and the promise of victory to the Athenians if they fought in their own country, this meant no less than to recall them to Attica and forbid their taking any further part in the war. Whilst Aristeides was thus perplexed, Arimnestus, the general of the Platæans, saw a vision in his sleep. In his dreams he thought that Zeus the Preserver appeared and enquired of him what the Greeks had decided to do, and that he answered, "Lord, to-morrow we shall lead away the army to Eleusis, and fight the Persians there, according to the oracle." Upon this the god answered, that they had missed the meaning of the oracle, for the places mentioned were near Platæa, where they themselves were encamped, and if they sought they would find them. Arimnestus, after this distinct vision, awoke. He at once sent for the oldest and most learned of the citizens of Platæa, and after debating the matter with them, discovered that near Hysiæ, under Mount Kithæron, stood a very ancient temple, dedicated to the Eleusinian Demeter and her daughter. He immediately took Aristeides with him and proceeded to the spot, which was excellently placed for the array of an infantry force in the presence of an overwhelming cavalry, because the spurs of Mount Kithæron, where they run down into the plain by the temple, render the ground impassable for cavalry. Close by is the chapel of the hero Androkrates, in the midst of a thick matted grove of trees.