History of the Peloponnesian War

In the mean time, Sitalces conferred with Perdiccas on the objects of his expedition; and since the Athenians had not joined him with their fleet, (not believing that he would come,) but had sent presents and envoys to him, he sent a part of his forces against the Chalcidians and Bottiaeans, and after shutting them up within their walls, laid waste their country.

While he was staying in these parts, the people towards the south, as the Thessalians, the Magnesians, with others who were subject to the Thessalians, and the Greeks as far as Thermopylae, were afraid that the army might advance against them, and were preparing [for such an event].

The northward Thracians, too, beyond the Strymon were alarmed, as many as lived in a champaign country, namely, the Panaei, the Odomanti, the Droi, and the Dersaei; who are all independent.

Nay, it afforded subject of discussion even with the Greeks who were enemies of the Athenians, whether they were not led on by that people on the strength of their alliance, and might not come against them also.

Sitalces then was commanding at once Chalcidice, Bottica, and Macedonia, and was ravaging them all. But when none of the objects for which he made the expedition was being gained by him, and he found his army without provisions and suffering from the severity of the weather, he was persuaded by Seuthes the son of Spardacus, who was his nephew and next in authority to himself, to return with all speed. For Seuthes had been secretly won over by Perdiccas, who promised to give him his sister, and a sum of money with her.

Thus persuaded then, after remaining [in the enemy's country] thirty days in all, and eight of them in Chalcidice, he retired home with his army as quickly as he could: and Perdiccas subsequently gave his sister Stratonice to Seuthes, as he had promised. Such were the events that happened in the expedition of Sitalces.