Now when the opportunity seemed convenient for action, they set out in two companies; Pelopidas and Damoclides with their party went against Leontidas and Hypates, that lived near together; Charon and Melon against Archias and Philip, having put on women's apparel over their breastplates, and thick garlands of fir and pine to shade their faces; and so, as soon as they came to the door, the guests clapped and gave an huzza, supposing them to be the women they expected. But when the conspirators had looked about the room, and carefully marked all that were at the entertainment, they drew their swords, and making at Archias and Philip amongst the tables, disclosed who they were. Phillidas persuaded some few of his guests to sit still, and those that got up and endeavoured to assist the polemarch, being drunk, were easily despatched. But Pelopidas and his party met with a harder task; as they attempted Leontidas, a sober and formidable man, and when they came to his house found his door shut, he being already gone to bed. They knocked a long time before any one would answer, but at last, a servant that heard them, coming out and unbarring the door, as soon as the gate gave way, they rushed in, and, overturning the man, made all haste to Leontidas's chamber. But Leontidas, guessing at the matter by the noise and running, leaped from his bed and drew his dagger, but forgot to put out the lights, and by that means make them fall foul of one another in the dark. As it was, being easily seen by reason of the light, he received them at his chamber door and stabbed Cephisodorus, the first man that entered: on his falling, the next that he engaged was Pelopidas; and the passage being narrow and Cephisodorus's body lying in the way, there was a fierce and dangerous conflict. At last Pelopidas prevailed, and having killed Leontidas, he and his companions went in pursuit of Hypates, and after the same manner broke into his house. He perceived the design and fled to his neighbours;but they closely followed, and caught and killed him.
This done they joined Melon and sent to hasten the exiles they had left in Attica: and called upon the citizens to maintain their liberty, and taking down the spoils from the porches, and breaking open all the armourers' shops that were near, equipped those that came to their assistance. Epaminondas and Gorgidas came in already armed, with a gallant train of young men and the best of the old. Now the city was in a great excitement and confusion, a great noise and hurry, lights set up in every house, men running here and there; however, the people did not as yet gather into a body, but, amazed at the proceedings, and not clearly understanding the matter, waited for the day. And, therefore, the Spartan officers were thought to have been in fault for not falling on at once, since their garrison consisted of about fifteen hundred men, and many of the citizens ran to them; but, alarmed with the noise, the fires, and the confused running of the people, they kept quietly within the Cadmea. As soon as day appeared, the exiles from Attica came in armed, and there was a general assembly of the people. Epaminondas and Gorgidas brought forth Pelopidas and his party, encompassed by the priests, who held out garlands, and exhorted the people to fight for their country and their gods. The assembly, at their appearance, rose up in a body and with shouts and acclamations received the men as their deliverers and benefactors.
Then Pelopidas, being chosen chief captain of Boeotia, together with Melon and Charon, proceeded at once to blockade the citadel and stormed it on all sides, being extremely desirous to expel the Lacedaemonians, and free the Cadmea, before an army could come from Sparta to their relief. And he just so narrowly succeeded, that they, having surrendered on terms and departed, on their way home met Cleombrotus at Megara marching towards Thebes with a considerable force. The Spartans condemned and executed Herippidas and Arcissus, two of their governors, at Thebes, and Lysanoridas the third, being severely fined, fled to Peloponnesus. This action so closely resembling that of Thrasybulus, in the courage of the actors, the danger, the encounters, and equally crowned with success, was called the sister of it by the Greeks. For we can scarcely find any other examples where so small and weak a party of men by bold courage overcame such numerous and powerful enemies, or brought greater blessings to their country by so doing. But the subsequent change of affairs made this action the more famous; for the war which forever ruined the pretensions of Sparta to command, and put an end to the supremacy she then exercised alike by sea and by land, proceeded from that night, in which Pelopidas not surprising any fort, or castle, or citadel, but coming, the twelfth man, to a private house, loosed and broke, if we may speak truth in metaphor, the chains of the Spartan sway, which before seemed of adamant and indissoluble.