History of the Peloponnesian War

After this Thucydides assured Eion, so as it should be safe both for the present, though Brasidas should assault it, and for the future; and took into it such as, according to the proclamation made, came down from Amphipolis.

Brasidas with many boats came suddenly down the river to Eion and attempted to seize on the point of the ground lying out from the wall into the sea, and thereby to command the mouth of the river; he assayed also the same at the same time by land, and was in both beaten off; but Amphipolis he furnished with all things necessary.

Then revolted to him Myrcinus, a city of the Edonians, Pittacus, the king of the Edonians, being slain by the sons of Goaxis and by Braures his own wife. And not long after Gapselus also, and Oesyme, colonies of the Thasians. Perdiccas also, after the taking of these places, came to him and helped him in assuring of the same.

After Amphipolis was taken, the Athenians were brought into great fear, especially for that it was a city that yielded them much profit, both in timber which is sent them for the building of galleys and in revenue of money, and because also, though the Lacedaemonians had a passage open to come against their confederates, the Thessalians convoying them, as far as to Strymon, yet if they had not gotten that bridge, the river being upwards nothing but a vast fen, and towards Eion well guarded with their galleys, they could have gone no further; which now they thought they might easily do, and therefore feared lest their confederates should revolt.