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.
while the Athenians, supposing that they had returned to the town because they felt they were beaten, disembarked at their leisure and set about getting their dinners and about their other occupations, under the idea that they had done with fighting for that day.
Suddenly the Syracusans manned their ships and again sailed against them; and the Athenians, in great confusion and most of them fasting, got on board, and with great difficulty put out to meet them.
For some time both parties remained on the defensive without engaging, until the Athenians at last resolved not to let themselves be worn out by waiting where they were, but to attack without delay, and giving a cheer, went into action.