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.
He thought the place itself a good position for encamping; and it seemed likely that such an important part of the state as the three thousand heavy infantry of the Acharnians would refuse to submit to the ruin of their property, and would force a battle on the rest of the citizens. On the other hand, should the Athenians not take the field during this incursion, he could then fearlessly ravage the plain in future invasions, and extend his advance up to the very walls of Athens. After the Acharnians had lost their own property they would be less willing to risk themselves for that of their neighbors; and so there would be division in the Athenian counsels.
These were the motives of Archidamus for remaining at Acharnae.
In the meanwhile, as long as the army was at Eleusis and the Thriasian plain, hopes were still entertained of its not advancing any nearer. It was remembered that Pleistoanax, son of Pausanias, king of Lacedaemon, had invaded Attica with a Peloponnesian army fourteen years before, but had retreated without advancing farther than Eleusis and Thria, which indeed proved the cause of his exile from Sparta, as it was thought he had been bribed to retreat.
But when they saw the army at Acharnae, barely seven miles from Athens, they lost all patience. The territory of Athens was being ravaged before the very eyes of the Athenians, a sight which the young men had never seen before and the old only in the Median wars; and it was naturally thought a grievous insult, and the determination was universal, especially among the young men, to sally forth and stop it.
Knots were formed in the streets and engaged in hot discussion; for if the proposed sally was warmly recommended, it was also in some cases opposed. Oracles of the most various import were recited by the collectors, and found eager listeners in one or other of the disputants. Foremost in pressing for the sally were the Acharnians, as constituting no small part of the army of the state, and as it was their land that was being ravaged. In short, the whole city was in a most excited state; Pericles was the object of general indignation; his previous counsels were totally forgotten; he was abused for not leading out the army which he commanded, and was made responsible for the whole of the public suffering.