Plutarch, Pelopidas
Bernadotte Perrin, Ed.

23. In the battle, while Epaminondas was drawing his phalanx obliquely towards the left, in order that the right wing of the Spartans might be separated as far as possible from the rest of the Greeks, and that he might thrust back Cleombrotus by a fierce charge in column with all his men-at-arms, the enemy understood what he was doing and began to change their formation; [2] they were opening up their right wing and making an encircling movement, in order to surround Epaminondas and envelop him with their numbers. But at this point Pelopidas darted forth from his position, and with his band of three hundred on the run, came up¹ before Cleombrotus had either extended his wing or brought it back again into its old position and closed up his line of battle, so that the Lacedaemonians were not standing in array, but moving confusedly about among each other when his onset reached them. [3] And yet the Spartans, who were of all men past masters in the art of war, trained and accustomed themselves to nothing so much as not to straggle or get into confusion upon a change of formation, but to take anyone without exception as neighbour in rank or in file, and wheresoever danger actually threatened, to seize that point and form in close array and fight as well as ever. [4] At this time, however, since the phalanx of Epaminondas bore down upon them alone and neglected the rest of their force, and since Pelopidas engaged them with incredible speed and boldness, their courage and skill were so confounded that there was a flight and slaughter of the Spartans such as had never before been seen. Therefore, although Epaminondas was boeotarch, Pelopidas, who was not boeotarch, and commanded only a small portion of the whole force, won as much glory for the success of that victory as he did.