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.
he was eager to make the attempt. He thought this to be the shortest way to end the war; for he would either be successful and take Syracuse, or else would lead his army home and not wear out to no purpose both the Athenians who took part in the expedition and the entire state.
In the first place, then, the Athenians went out and proceeded to ravage the land of the Syracusans in the region of the Anapus river, and at this time, as at first, they had the upper hand with their army both by land and by sea; for on neither element did the Syracusans come out to meet them except with their cavalry and javelin-men from the Olympieium.
Afterwards it seemed best to Demosthenes, before going further, to make an attempt with engines upon the cross-wall. But when he brought his engines up they were burned by the enemy, who defended themselves from the wall, and the assaults which he made at many points with the rest of his army were regularly repulsed; it therefore seemed best not to waste more time, and so with the consent of Nicias and his other colleagues he undertook, as he had planned, the attack upon Epipolae.
Now it seemed impossible to approach the heights in the daytime and make the ascent without being observed; he accordingly ordered provisions for five days, took with him all the stonemasons and carpenters, and also a supply of arrows, and whatever things they would need while building a wall, in case they should succeed in their undertaking, and after the first watch, accompanied by Eurymedon and Menander, led out the entire army and advanced to Epipolae, leaving Nicias behind in the fortifications.
When they had reached Epipolae, taking the route by Euryelus, which had been followed by the former army in the first ascent, they got by the Syracusan guards without being observed, and advancing to the Syracusan fort at that point captured it and killed some of the guards;
most of these, however, fled at once to the camps, of which there were three upon Epipolae—one belonging to the Syracusans, one to the other Siceliots, and one to the allies—and brought word of the attack, informing also the six hundred Syracusans who were posted as an advanced guard on that part of Epipolae.