History of the Peloponnesian War

His object in this was to make the Argives and their allies come down from the hill, to resist the diversion of the water, as they would be sure to do when they knew of it, and thus to fight the battle in the plain. He accordingly stayed that day where he was, engaged in turning off the water. The Argives and their allies were at first amazed at the sudden retreat of the enemy after advancing so near, and did not know what to make of it; but when he had gone away and disappeared, without their having stirred to pursue him, they began anew to find fault with their generals, who had not only let the Lacedaemonians get off before, when they were so happily intercepted before Argos, but who now again allowed them to run away, without any one pursuing them, and to escape at their leisure while the Argive army was leisurely betrayed.

The generals, half-stunned for the moment, afterwards led them down from the hill, and went forward and encamped in the plain, with the intention of attacking the enemy.