On the latter occasion Epaminondas captured the Thespians who had taken refuge in Ceressus, and immediately afterwards devoted his attention to the situation in the Peloponnesus, to which also the Arcadians were eagerly inviting him. On his arrival he won the willing support of Argos, while he collected again into their ancient city the Mantineans, who had been scattered into village communities by Agesipolis. He persuaded the Arcadians to destroy all their weak towns, and built them a home where they could live together, which even at the present day is called Megalopolis (Great City).

The period of his office as Boeotarch had now expired, and death was the penalty fixed if a man exceeded it. So Epaminondas, disregarding the law as out of date, remained in office, marched to Sparta with his army, and when Agesilaus did not come out to meet him, turned to the founding of Messene. Epaminondas, was the founder of the modern Messene, and the history of its foundation I have included in my account of the Messenians themselves.

Meanwhile the allies of Thebes scattered and overran the Laconian territory, pillaging what it contained. This persuaded Epaminondas to lead the Thebans back to Boeotia. In his advance with the army he came over against Lechaeum, and was about to cross the narrow and difficult parts of the road, when Iphicrates, the son of Timotheus, attacked the Thebans with a force of targeteers and other Athenians.

Epaminondas put his assailants to flight and came right up to the very city of Athens, but as Iphicrates dissuaded the Athenians from coming out to fight, he proceeded to march back to Thebes. Epaminondas stood his trial on a capital charge for holding the office of Boeotarch when his tenure had already expired. It is said that the jury appointed to try him did not even record their votes on the charge.

After these things when Alexander held sway in Thessaly, Pelopidas came to him, under the impression that he was well-disposed to him personally as well as a friend to the Theban commonwealth, but on his arrival was treacherously and insolently thrown into prison and kept there by Alexander. The Thebans at once set out to attack Alexander, and made leaders of the expedition Cleomenes and Hypatus, who were Boeotarchs at that time; Epaminondas was serving in the ranks.

When the force had reached the other side of Thermopylae, Alexander surprised and attacked it on difficult ground. As there appeared to be no means of safety, the rest of the army chose Epaminondas to be leader, and the Boeotarchs of their own accord resigned the command. Alexander lost confidence in winning the war when he saw Epaminondas at the head of his opponents, and of his own accord set free Pelopidas.

In the absence of Epaminondas the Thebans removed the Orchomenians from their land. Epaminondas regarded their removal as a disaster, and declared that had he been present never would the Thebans have been guilty of such an outrage.