History of the Peloponnesian War

As for the Athenians, so long as the army was in the neighbourhood of Eleusis and the Thriasian plain, they had some hope of its not advancing nearer; remembering the case of Pleistoanax, the son of Pausanias, the king of the Lacedaemonians, when with a Peloponnesian army he made an inroad into Attica, as far as Eleusis and Thria, fourteen years before this war, and retired again without advancing any further (for which reason indeed he was banished from Sparta, as he was thought to have been bribed to make the retreat).

When, however, they saw the army at Acharnae, only sixty stades from the city, they considered it no longer bearable, and, as was natural, when their land was being ravaged before their eyes—a thing which the younger men had never yet seen, nor even the elder, except in the Persian wars—it was thought a great indignity, and all of them, especially the young men, determined to go out against them, and not to put up with it.