History of the Peloponnesian War

Brasidas, the son of Tellus, a Lacedaemonian, happened at this time to be about Sicyon and Corinth, preparing of an army to go into Thrace. And when he heard of the taking of the long walls, fearing what might become of the Peloponnesians in Nisaea, and lest Megara should be won, sent unto the Boeotians, willing them to meet him speedily with their forces at Tripodiscus, a village of Megaris so called at the foot of the hill Geraneia; and he marched presently himself with two thousand seven hundred men of arms of Corinth, four hundred of Phlius, six hundred of Sicyon, and those of his own all that he had yet levied, thinking to have found Nisaea yet untaken.

When he heard the contrary (for he set forth towards Tripodiscus in the night), with three hundred men chosen out of the whole army, before news should arrive of his coming, he came unseen of the Athenians that lay by the sea-side to the city of Megara, pretending in word, and intending also in good earnest if he could have done it, to attempt upon Nisaea, but desiring to get into Megara to confirm it; and required to be let in, for that he was, he said, in hope to recover Nisaea.