Two years later, Pelopidas himself conducted an army against Alexander, and gained a great victory over him at Cyn´oceph´alæ. Rage at the sight of his old enemy overcame his prudence, and he fell furiously fighting in the midst of Alexander’s guards. The Thebans felt more grief at his death than joy in the victory, but they did not fail to follow it up with a fresh army, which stripped Alexander of all his possessions except the city of Pheræ, and established Theban supremacy throughout northern Greece. =243.= The war in the Peloponnesus was now varied by an act of sacrilege. The Arcadians seized the Sacred Grove at Olympia during the year of the festival, expelled the Eleans from their supervision of the games, and installed the Pisatans in their place. A large army of the Arcadians and their allies was present to enforce this irregular proceeding. The Eleans came up in the midst of the games, supported by their allies, the Achæans, and a battle was fought on the sacred ground. The very temple of Olympic Zeus became a fortress, and the gold and ivory statue by Phidias looked down upon a scene of unprecedented strife. The treasury of the shrine was despoiled by the invaders. Arcadia itself was divided by this impious act. The Mantineans refused all share in the spoils, and were on that account proclaimed traitors to the league. Peace was at length made with Elis, but two parties remained in Arcadia: the Mantineans, in alliance with Sparta; and the Tegeans, with the other towns which favored Thebes. Hostilities were frequent, and envoys were sent to Epaminondas demanding his intervention. =244.= In the summer of 362 B. C., the great general invaded Peloponnesus for the fourth and last time. At Tegea he was joined by his allies, while Agesilaus moved with a Spartan force toward Mantinea. Placed thus between the king and his capital, Epaminondas seized the occasion to make a sudden attack upon Sparta. Agesilaus heard of it in time to return, and though a battle was fought in the very streets of the capital, the invader was compelled to retire. With his usual swiftness, Epaminondas moved back to surprise Mantinea while the Spartan army was withdrawn. The citizens with their slaves were dispersed in the fields, for it was the time of harvest; but a troop of Athenian cavalry had just arrived, and, though tired and hungry, they succeeded in repulsing the Thebans.