History of the Peloponnesian War

Accordingly they also joined in the investment, and besieged Pydna for a while. Subsequently they came to terms and concluded a forced alliance with Perdiccas, hastened by the calls of Potidaea, and by the arrival of Aristeus at that place. They withdrew from Macedonia,

going to Beroea and thence to Strepsa, and, after a futile attempt on the latter place, they pursued by land their march to Potidaea with three thousand heavy infantry of their own citizens, besides a number of their allies, and six hundred Macedonian horsemen, the followers of Philip and Pausanias. With these sailed seventy ships along the coast.

Advancing by short marches, on the third day they arrived at Gigonus, where they encamped.

Meanwhile the Potidaeans and the Peloponnesians with Aristeus were encamped on the side looking towards Olynthus on the isthmus, in expectation of the Athenians, and had established their market outside the city.