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.
After remaining quiet for some time, Cleon was at length obliged to do as Brasidas expected. His soldiers, tired of their inactivity, began also seriously to reflect on the weakness and incompetence of their commander, and the skill and valour that would be opposed to him, and on their own original unwillingness to accompany him. These murmurs coming to the ears of Cleon, he resolved not to disgust the army by keeping it in the same place, and broke up his camp and advanced. The temper of the general was what it had been at Pylos, his success on that occasion having given him confidence in his capacity. He never dreamed of any one coming out to fight him, but said that he was rather going up to view the place; and if he waited for his reinforcements, it was not in order to make victory secure in case he should be compelled to engage, but to be enabled to surround and storm the city. He accordingly came and posted his army upon a strong hill in front of Amphipolis, and proceeded to examine the lake formed by the Strymon, and how the town lay on the side of Thrace. He thought to retire at pleasure without fighting, as there was no one to be seen upon the wall or coming out of the gates, all of which were shut. Indeed, it seemed a mistake not to have brought down engines with him; he could then have taken the town, there being no one to defend it.
As soon as Brasidas saw the Athenians in motion he descended himself from Cerdylium and entered Amphipolis. He did not venture to go out in regular order against the Athenians: he mistrusted his strength, and thought it inadequate to the attempt; not in numbers- these were not so unequal- but in quality, the flower of the Athenian army being in the field, with the best of the Lemnians and Imbrians. He therefore prepared to assail them by stratagem. By showing the enemy the number of his troops, and the shifts which he had been put to to to arm them, he thought that he should have less chance of beating him than by not letting him have a sight of them, and thus learn how good a right he had to despise them. He accordingly picked out a hundred and fifty heavy infantry and, putting the rest under Clearidas, determined to attack suddenly before the Athenians retired;thinking that he should not have again such a chance of catching them alone, if their reinforcements were once allowed to come up;and so calling all his soldiers together in order to encourage them and explain his intention, spoke as follows:
"Peloponnesians, the character of the country from which we have come, one which has always owed its ******* to valour, and the fact that you are Dorians and the enemy you are about to fight Ionians, whom you are accustomed to beat, are things that do not need further comment. But the plan of attack that I propose to pursue, this it is as well to explain, in order that the fact of our adventuring with a part instead of with the whole of our forces may not damp your courage by the apparent disadvantage at which it places you. I imagine it is the poor opinion that he has of us, and the fact that he has no idea of any one coming out to engage him, that has made the enemy march up to the place and carelessly look about him as he is doing, without noticing us. But the most successful soldier will always be the man who most happily detects a blunder like this, and who carefully consulting his own means makes his attack not so much by open and regular approaches, as by seizing the opportunity of the moment; and these stratagems, which do the greatest service to our friends by most completely deceiving our enemies, have the most brilliant name in war. Therefore, while their careless confidence continues, and they are still thinking, as in my judgment they are now doing, more of retreat than of maintaining their position, while their spirit is slack and not high-strung with expectation, I with the men under my command will, if possible, take them by surprise and fall with a run upon their centre; and do you, Clearidas, afterwards, when you see me already upon them, and, as is likely, dealing terror among them, take with you the Amphipolitans, and the rest of the allies, and suddenly open the gates and dash at them, and hasten to engage as quickly as you can. That is our best chance of establishing a panic among them, as a fresh assailant has always more terrors for an enemy than the one he is immediately engaged with.