Cleon, whom we left on his voyage from Torone to Amphipolis, made Eion his base, and after an unsuccessful assault upon the Andrian colony of Stagirus, took Galepsus, a colony of Thasos, by storm. He now sent envoys to Perdiccas to command his attendance with an army, as provided by the alliance; and others to Thrace, to Polles, king of the Odomantians, who was to bring as many Thracian mercenaries as possible; and himself remained inactive in Eion, awaiting their arrival. Informed of this, Brasidas on his part took up a position of observation upon Cerdylium, a place situated in the Argilian country on high ground across the river, not far from Amphipolis, and commanding a view on all sides, and thus made it impossible for Cleon's army to move without his seeing it; for he fully expected that Cleon, despising the scanty numbers of his opponent, would march against Amphipolis with the force that he had got with him. At the same time Brasidas made his preparations, calling to his standard fifteen hundred Thracian mercenaries, and all the Edonians, horse and targeteers; he also had a thousand Myrcinian and Chalcidian targeteers, besides those in Amphipolis, and a force of heavy infantry numbering altogether about two thousand, and three hundred Hellenic horse. Fifteen hundred of these he had with him upon Cerdylium; the rest were stationed with Clearidas in Amphipolis.