Phraortês (658-636 B. C.), having extended the dominion of the Medes over a large portion of Upper Asia, and conquered both the Persians and several other nations, was ultimately defeated and slain in a war against the Assyrians of Nineveh: who, though deprived of their external dependencies, were yet brave and powerful by themselves. His son Kyaxarês (636-595 B. C.) followed up with still greater energy the same plans of conquest, and is said to have been the first who introduced any organization into the military force;—before his time, archers, spearmen, and cavalry had been confounded together indiscriminately, until this monarch established separate divisions for each. He extended the Median dominion to the eastern bank of the Halys, which river afterwards, by the conquests of the Lydian king Crœsus, became the boundary between the Lydian and Median empires; and he carried on war for six years with Alyattês king of Lydia, in consequence of the refusal of the latter to give up a band of Scythian nomads, who, having quitted the territory of Kyaxarês in order to escape severities with which they were menaced, had sought refuge as suppliants in Lydia.[442] The war, indecisive as respects success, was brought to its close by a remarkable incident: in the midst of a battle between the Median and Lydian armies, there happened a total eclipse of the sun, which occasioned equal alarm to both parties, and induced them immediately to cease hostilities.[443] The Kilikian prince Syennesis, and the Babylonian prince Labynêtus, interposed their mediation, and effected a reconciliation between Kyaxarês and Alyattês, one of the conditions of which was, that Alyattês gave his daughter Aryênis in marriage to Astyagês son of Kyaxarês. In this manner began the connection between the Lydian and Median kings which afterwards proved so ruinous to Crœsus. It is affirmed that the Greek philosopher Thalês foretold this eclipse; but we may reasonably consider the supposed prediction as not less apocryphal than some others ascribed to him, and doubt whether at that time any living Greek possessed either knowledge or scientific capacity sufficient for such a calculation.[444] The eclipse itself, and its terrific working upon the minds of the combatants, are facts not to be called in question; though the diversity of opinion among chronologists, respecting the date of it, is astonishing.[445]