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.
But the Syracusans and their allies, as well as Gylippus with his own troops, came up from the outworks; yet, since this daring attempt had been made upon them unexpectedly at night, they were still dazed as they attacked the Athenians and were at first forced back by them.
But while the Athenians were by now going forward, in some disorder, considering themselves victorious and wishing as quickly as possible to push their way through all the enemy's forces that had not yet been engaged, in order that they might not rally again when they themselves relaxed their onset, it was the Boeotians who first made a stand against them, and by making a charge routed and put them to flight.
By this time the Athenians were getting into a state of so great confusion and perplexity that it has not been easy to learn from either side just how the several events occurred. In the daytime things are clearer, of course, yet even so those who are present do not know everything that happens, but each man barely knows what happens near himself; but in a battle by night—the only one that took place in this war between large armies—how could anyone know anything clearly?
For though there was a bright moon, they could only see one another, as it is natural to do in moonlight—seeing before them the vision of a person but mistrusting their recognition of their own friends. There were, besides, large numbers of hoplites belonging to both sides moving about in a narrow space. And on the Athenian side, some were already being defeated, while others, still in their first onset, were advancing unchecked;
but of the rest of their army a large portion had only just finished the ascent and others were still coming up, so that they did not know which body to join. For the front lines were already all in confusion in consequence of the rout that had taken place, and the two sides were difficult to distinguish by reason of the outcries.