There was a disaffected party in Amphipolis, who had planned the betrayal of the place, acting in concert with Argilus, through the agency of certain Argilian citizens residing in the town.

The Athenians were thus left free to turn their attention to Amphipolis, and at the beginning of the tenth year of the war, the truce having now expired, Cleon was sent with a fleet of thirty ships to conduct the siege of this important place.

These men now saw their opportunity arrive with Brasidas, and having for some time been in correspondence with their countrymen in Amphipolis for the betrayal of the town, at once received him into Argilus, and revolted from the Athenians, and that same night took him on to the bridge over the river; where he found only a small guard to oppose him, the town being at some distance from the passage, and the walls not reaching down to it as at present.

Then he took up his station with a picked troop of a hundred and fifty hoplites at the southern gate of Amphipolis, leaving Clearidas in charge of the main body, and awaited a favourable moment to attack. But these preparations could not be made without exciting some attention among the more experienced of the Athenian officers.

Accordingly, in the winter after the battle of Amphipolis, negotiations were resumed, and early in the following spring a treaty of peace was concluded between Athens and Sparta, on the understanding that all places taken by force of arms should be restored, and all prisoners set at liberty.

Kleon was able to commit many crimes undetected, and Brasidas performed many great exploits while the war lasted; wherefore, when both of these men fell before the walls of Amphipolis, Nikias, perceiving that the Spartans had long been desirous of peace, and that the Athenians no longer hoped to gain anything by continuing the war, and that both parties were weary of it, began to consider how he might reconcile them, and also pacify all the other states of Greece, so as to establish peace upon a durable and prosperous basis.

It was also my fate to be an exile from my country for twenty years after my command at Amphipolis; and being present with both parties, and more especially with the Peloponnesians by reason of my exile, I had leisure to observe affairs somewhat particularly.

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.

The fall of Amphipolis, which occurred shortly after the crushing defeat at Delium, caused great consternation among the Athenians. Apart from the wound to their pride, they were deprived by this loss of a large portion of their revenue, and cut off from the principal source of their timber supply. And there were still further grounds for alarm.

In this city Olympias had taken refuge together with Roxana and her son; but after a blockade of some months it was obliged to surrender. Olympias had stipulated that her life should be spared, but Cassander soon afterwards caused her to be murdered, and kept Roxana and her son in custody in the citadel of Amphipolis. A new war now broke out in the East.