History of the Peloponnesian War

And they had been the most distressed part of all the army had not their horsemen come in to help them.

Withal it fell out that Agis, when he perceived the left wing of his own army to labour, namely, that which was opposed to the Mantineans and to those thousand Argives, commanded the whole army to go and relieve the part overcome. By which means the Athenians and such of the Argives as, together with them, were overlaid, whilst the army passed by and declined them, saved themselves at leisure. And the Mantineans with their confederates and those chosen Argives had no more mind now of pressing upon their enemies, but seeing their side was overcome and the Lacedaemonians approaching them, presently turned their backs.

Of the Mantineans the greatest part were slain; but of those chosen Argives the most were saved; by reason the flight and going off was neither hasty nor long. For the Lacedaemonians fight long and constantly, till they have made the enemy to turn his back; but that done, they follow him not far.