History of the Peloponnesian War

For these reasons the thing appeared impracticable to the magistrates; and Hermocrates, finding himself unable to do anything further with them, had now recourse to the following stratagem of his own. What he feared was that the Athenians might quietly get the start of them by passing the most difficult places during the night; and he therefore sent, as soon as it was dusk, some friends of his own to the camp with some horsemen who rode up within earshot and called out to some of the men, as though they were well-wishers of the Athenians, and told them to tell Nicias (who had in fact some correspondence who informed him of what went on inside the town), not to lead off the army by night as the Syracusans were guarding the roads, but to make his preparations at his leisure and to retreat by day.

After saying this they departed; and their hearers informed the Athenian generals,