Cleomenes, however, fully aware that the Athenians had done him wrong in word and deed, mustered an army from the whole of the +Peloponnese [22,37.5] (region), Greece, Europe Peloponnesus. He did not declare the purpose for which he mustered it, namely to avenge himself on the Athenian people and set up Isagoras, who had come with him out of the acropolis, as tyrant.

Cleomenes broke in as far as +Eleusis [23.5583,38.0417] (Perseus) Eleusis with a great host, and the Boeotians, by a concerted plan, took Oenoe and Hysiae, districts on the borders of Attica [23.5,38.83] (department), Central Greece and Euboea, Greece, Europe Attica, while the Chalcidians attacked on another side and raided lands in Attica [23.5,38.83] (department), Central Greece and Euboea, Greece, Europe Attica. The Athenians, who were now caught in a ring of foes, decided to oppose the Spartans at +Eleusis [23.5583,38.0417] (Perseus) Eleusis and to deal with the Boeotians and Chalcidians later.

When the armies were about to join battle, the Corinthians, coming to the conclusion that they were acting wrongly, changed their minds and departed. Later Demaratus son of Ariston, the other king of Sparta [22.4417,37.0667] (Perseus) Sparta, did likewise, despite the fact that he had come with Cleomenes from Sparta [22.416,37.83] (inhabited place), Laconia, Peloponnese, Greece, Europe Lacedaemon in joint command of the army and had not till now been at variance with him.