History of the Peloponnesian War

When there was no end of the business, the captain of the Messenians said unto Cleon and Demosthenes that they spent their labour there in vain and that if they would deliver unto him a part of the archers and light-armed soldiers to get up by such a way as he himself should find out and come behind upon their backs, he thought the entrance might be forced.

And having received the forces he asked, he took his way from a place out of sight to the Lacedaemonians that he might not be discovered making his approach under the cliffs of the island where they were continual in which part, trusting to the natural strength thereof, they kept no watch, and with much labour and hardly unseen, came behind them, and appearing suddenly from above at their backs, both terrified the enemies with the sight of what they expected not and much confirmed the Athenians with the sight of what they expected.

And the Lacedaemonians, being now charged with their shot both before and behind, were in the same case (to compare small matters with great) that they were in at Thermopylae. For then they were slain by the Persians, shut up on both sides in a narrow path; and these now, being charged on both sides, could make good the place no longer, but fighting few against many and being weak withal for want of food, were at last forced to give ground; and the Athenians by this time were also masters of all the entrances.

But Cleon and Demosthenes, knowing that the more they gave back the faster they would be killed by their army, stayed the fight and held in the soldiers, with desire to carry them alive to Athens in case their spirits were so much broken and their courage abated by this misery as upon proclamation made they would be content to deliver up their arms.

So they proclaimed that they should deliver up their arms and themselves to the Athenians to be disposed of as to them should seem good.