History of the Peloponnesian War

The same summer and simultaneously with the expedition against Plataea, the Athenians marched with two thousand heavy infantry and two hundred horse against the Chalcidians in the direction of Thrace and the Bottiaeans, just as the corn was getting ripe, under the command of Xenophon, son of Euripides, with two colleagues.

Arriving before Spartolus in Bottiaea, they destroyed the corn and had some hopes of the city coming over through the intrigues of a faction within. But those of a different way of thinking had sent to Olynthus; and a garrison of heavy infantry and other troops arrived accordingly. These issuing from Spartolus were engaged by the Athenians in front of the town:

the Chalcidian heavy infantry, and some auxiliaries with them, were beaten and retreated into Spartolus; but the Chalcidian horse and light troops defeated the horse and light troops of the Athenians.

The Chalcidians had already a few targeteers from Crusis, and presently after the battle were joined by some others from Olynthus;