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The situation appeared to be convenient, and the Acharnians, being a considerable section of the city and furnishing three thousand hoplites, were likely to be impatient at the destruction of their property, and would communicate to the whole people a desire to fight. Or if the Athenians did not come out to meet him during this invasion, he could henceforward ravage the plain with more confidence, and march right up to the walls of the city. The Acharnians, having lost their own possessions, would be less willing to hazard their lives on behalf of their neighours, and so there would be a division in the Athenian counsels.
Such was the motive of Archidamus in remaining at Acharnae.
(Book 2 Chapter 20.4-5)
But when they (Athenians) saw the army in the neighbourhood of Acharnae, and barely seven miles from the city, they felt the presence of the invader to be intolerable. The devastation of their country before their eyes, which the younger men had never seen at all, nor the elder except in the Persian invasion, naturally appeared to them a horrible thing, and the whole people, the young men especially, were anxious to go forth and put a stop to it.
Knots were formed in the streets, and there were loud disputes, some eager to go out, a minority resisting. Soothsayers were repeating oracles of the most different kinds, which all found in some one or other enthusiastic listeners. The Acharnians, who in their own estimation were no small part of the Athenian state, seeing their land ravaged, strongly insisted that they should go out and fight.The excitement in the city was universal; the people were furious with Pericles, and, forgetting all his previous warnings, they abused him for not leading them to battle, as their general should, and laid all their miseries to his charge.
(Ibid Chapter 21.2-3)
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