History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
The Melians, too, took the part of the Athenian wall over against the market-place by a night assault; then having slain some of the men and brought in grain and as many other necessaries as they could, they withdrew and kept quiet. After that the Athenians maintained a better watch. So the summer ended.
The following winter the Lacedaemonians were on the point of invading Argive territory, but as the sacrifices for crossing the boundaries were not favourable they returned home. On account of this intention on the part of the Lacedaemonians, the Argives, suspecting certain men in their city, seized some of them, but the rest escaped.
About the same time the Melians again at another point took a part of the Athenian encompassing wall, the garrison not being numerous.