History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
And Brasidas suddenly sailed down the river to Eion with many boats, in the hope that by taking the point which juts out from the wall he might gain command of the entrance, and at the same time he made an attempt by land; but he was beaten back at both points, and then proceeded to put matters in order at Amphipolis.
Myrcinus also, an Edonian town, came over to him, Pittacus, the king of the Edonians, having been killed by the sons of Goaxis and his own wife Brauro; and not long afterwards Galepsus and Oesyme, colonies of the Thasians, also came over. Perdiccas,[*](Now evidently reconciled with Brasidas, with whom he had quarrelled (4.86.3); cf. 4.103.3.) too, came to Amphipolis directly after its capture and joined in arranging these matters.
The Athenians were greatly alarmed by the capture of Amphipolis. The chief reason was that the city was useful to them for the importation of timber for ship-building and for the revenue it produced, and also that, whereas hitherto the Lacedaemonians had possessed, under the guidance of the Thessalians, access to the Athenian allies as far as the Strymon, yet as long as they did not control the bridge—the river for a long way above the town being a great lake and triremes being on guard in the direction of Eion—they could not have advanced further; but now at last the matter had become easy.[*](Or, retaining ῥᾳδία of the MSS and the Vulgate reading ἐνομὶζετο, “but now the access was thought to have become easy.”) And they feared, too, the revolt of their allies.
For Brasidas in other things showed himself moderate, and in his declarations everywhere made plain that he had been sent out for the liberation of Hellas.
And the cities that were subject to Athens, hearing of the capture of Amphipolis and the assurances that were offered, and of the gentleness of Brasidas, were more than ever incited to revolution, and sent secret messengers to him, urging him to come on to them, and wishing each for itself to be the first to revolt.