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.
These at once advanced against the assailants, and falling in with Demosthenes and the Athenians, were routed by them after a sharp resistance, the victors immediately pushing on, eager to achieve the objects of the attack without giving time for their ardor to cool; meanwhile others from the very beginning were taking the counter wall of the Syracusans, which was abandoned by its garrison, and pulling down the battlements.
The Syracusans and the allies, and Gylippus with the troops under his command, advanced to the rescue from the outworks, but engaged in some consternation (a night attack being a piece of audacity which they had never expected), and were at first compelled to retreat.
But while the Athenians, flushed with their victory, now advanced with less order, wishing to make their way as quickly as possible through the whole force of the enemy not yet engaged, without relaxing their attack or giving them time to rally, the Boeotians made the first stand against them, attacked them, routed them, and put them to flight.