XV. After this cavalry action, both the parties remained quiet for a long time, for the soothsayers foretold victory both to the Greeks and to the Persians if they fought in self-defence, but foretold defeat if they attacked. At length Mardonius, as he only had provisions for a few days longer, and as the Greek army kept growing stronger by the continual reinforcements which it received, determined, sorely against his will, to delay no longer, but to cross the Asopus at daybreak and fall upon the Greeks unexpectedly. In the evening he gave orders to his captains to this effect. About midnight a solitary horseman rode up straight to the Greek camp. He bade the guard send for Aristeides the Athenian, who was at once brought, when the stranger spoke as follows:
“I am Alexander of Macedon, and I have come hither at the greatest risk to myself to do you a service, for fear you should be taken by surprise. Mardonius will attack to-morrow, not because he has any new hope of success, but because he is destitute of provisions, although the soothsayers all forbid him to fight because the sacrifices and oracles are unfavourable, and the army is disheartened. Thus he is forced to put all on a venture, or else to starve if he remains quiet.” When he had said this, Alexander begged Aristeides to keep the secret to himself, and communicate it to no one else. Aristeides, however, answered that it would not be right for him to conceal it from Pausanias, who was commander-in-chief. Before the battle he said that he would keep it secret from every one else, but that if Greece was victorious, all men then should know the good service so bravely rendered by Alexander. After these words the king of Macedon rode away, and Aristeides, proceeding to the tent of Pausanias, told him the whole matter; they then sent for the other generals, and ordered them to keep the troops under arms, as a battle was expected.
XVI. At this time, Herodotus tells us, Pausanias asked Aristeides to remove the Athenians from the left to the right wing, so as to be opposite to the native Persian troops, on the ground that they would