The reason for enslaving and subjugating these cities, was that he charged some of them with abandoning the army on the march against the Scythians, and others with injuring the army on its return. The latter charge would apply chiefly to Byzantium and Chalcedon.[283] It follows further from the narrative of Herodotus, that Darius awaited the result of the action of Megabyzus and Otanes at Sardis, and did not return to Persia till Megabyzus had penetrated to the west into Thracia, and he had established his brother Artaphernes as satrap at Sardis.[284] Of the Scythians Herodotus tells us that they pursued Darius with their united forces as far as the Thracian Chersonese; Miltiades did not venture to await their arrival there but fled, till the Scythians had retired and the Doloncians had brought him back. Next, in order to punish Darius for his invasion of their land, the Scythians sent an embassy to Sparta, in order to call upon the Spartans to cross over to Ephesus, while they attacked Media from the Phasis.[285] From this we conclude that a serious rebellion of the Greek cities on both shores of the straits and the Propontis broke out in the rear of Darius; that the cities thought Darius lost, or intended to prevent his return. Byzantium rebelled, though the tyrant Ariston was at the river with the fleet of the city; so also Abydus, whose tyrant Daphnis was likewise there with his fleet. Besides these cities, Perinthus, Chalcedon, Antandrus, and Lamponium, on the Ionian coast, are expressly mentioned as rebels. Strabo speaks generally of the cities round the Propontis in this sense. Herodotus tells us that Chalcedon was taken, and Ctesias that it was burnt. According to the latter the Chalcedonians were eager to destroy the bridge; but Darius was nevertheless able to pass it. Herodotus asserts that Darius passed on the ships from Sestus into Asia, and that the Scythians pursued him as far as the Thracian Chersonesus. This definite and double statement on the direction of the return march, and the passage of Darius into Asia, must be maintained against the inexact excerpt from Ctesias. If the bridge lay over the Bosphorus, Darius certainly did not march to the Hellespont.