Pelopidas (23.2-23.3)

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 up[*] 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.

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.