History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
The next winter the Lacedaemonians intended to invade the Argive territory, but arriving at the frontier found the sacrifices for crossing unfavorable, and went back again. This intention of theirs gave the Argives suspicions of certain of their fellow-citizens, some of whom they arrested; others, however, escaped them.
About the same time the Melians again took another part of the Athenian lines which were but feebly garrisoned.
Reinforcements afterwards arriving from Athens in consequence, under the command of Philocrates, son of Demeas, the siege was now pressed vigorously; and some treachery taking place inside, the Melians surrendered at discretion to the Athenians,