History of the Peloponnesian War

Meanwhile the Athenians, making a descent from their fleet upon Haliae, were engaged by a force of Corinthians and Epidaurians; and the Corinthians were victorious. Afterwards the Athenians engaged the Peloponnesian fleet off Cecruphalia; and the Athenians were victorious.

Subsequently war broke out between Aegina and Athens, and there was a great battle at sea off Aegina between the Athenians and Aeginetans, each being aided by their allies; in which victory remained with the Athenians, who took seventy of the enemy's ships, and landed in the country and commenced a siege under the command of Leocrates, son of Stroebus.

Upon this the Peloponnesians, desirous of aiding the Aeginetans, threw into Aegina a force of three hundred heavy infantry, who had before been serving with the Corinthians and Epidaurians. Meanwhile the Corinthians and their allies occupied the heights of Geraneia, and marched down into the Megarid, in the belief that with a large force absent in Aegina and Egypt, Athens would be unable to help the Megarians without raising the siege of Aegina.

But the Athenians, instead of moving the army of Aegina, raised a force of the old and young men that had been left in the city, and marched into the Megarid under the command of Myronides.