74. After this, seeing that Alyattes would not give up the Scythians when Kyaxares demanded them, there had arisen war between the Lydians and the Medes lasting five years; in which years the Medes often discomfited the Lydians and the Lydians often discomfited the Medes (and among others they fought also a battle by night): 88 and as they still carried on the war with equally balanced fortune, in the sixth year a battle took place in which it happened, when the fight had begun, that suddenly the day became night. And this change of the day Thales the Milesian had foretold to the Ionians laying down as a limit this very year in which the change took place. The Lydians however and the Medes, when they saw that it had become night instead of day, ceased from their fighting and were much more eager both of them that peace should be made between them. And they who brought about the peace between them were Syennesis the Kilikian and Labynetos the Babylonian: 89 these were they who urged also the taking of the oath by them, and they brought about an interchange of marriages; for they decided that Alyattes should give his daughter Aryenis to Astyages the son of Kyaxares, seeing that without the compulsion of a strong tie agreements are apt not to hold strongly together. Now these nations observe the same ceremonies in taking oaths as the Hellenes, and in addition to them they make incision into the skin of their arms, and then lick up the blood each of the other. 75. This Astyages then, being his mother's father, Cyrus had conquered and made prisoner for a reason which I shall declare in the history which comes after. 90 This then was the complaint which Croesus had against Cyrus when he sent to the Oracles to ask if he should march against the Persians; and when a deceitful answer had come back to him, he marched into the dominion of the Persians, supposing that the answer was favourable to himself. And when Croesus came to the river Halys, then, according to my account, he passed his army across by the bridges which there were; but, according to the account which prevails among the Hellenes, Thales the Milesian enabled him to pass his army across. For, say they, when Croesus was at a loss how his army should pass over the river (since, they add, there were not yet at that time the bridges which now there are), Thales being present in the army caused the river, which flowed then on the left hand of the army, to flow partly also on the right; and he did it thus:—beginning above the camp he proceeded to dig a deep channel, directing it in the form of a crescent moon, so that the river might take the camp there pitched in the rear, being turned aside from its ancient course by this way along the channel, and afterwards passing by the camp might fall again into its ancient course; so that as soon as the river was thus parted in two it became fordable by both branches: and some say even that the ancient course of the river was altogether dried up.