After the Acharnians had lost their own property they would be less willing to risk themselves for that of their neighbours; 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.
He, meanwhile, seeing anger and infatuation just now in the ascendant, and of his wisdom in refusing a sally, would not call either assembly or meeting of the people, fearing the fatal results of a debate inspired by passion and not by prudence. Accordingly he addressed himself to the defence of the city, and kept it as quiet as possible, though he constantly sent out cavalry to prevent raids on the lands near the city from flying parties of the enemy. There was a trifling affair at Phrygia between a squadron of the Athenian horse with the Thessalians and the Boeotian cavalry; in which the former had rather the best of it, until the heavy infantry advanced to the support of the Boeotians, when the Thessalians and Athenians were routed and lost a few men, whose bodies, however, were recovered the same day without a truce. The next day the Peloponnesians set up a trophy. Ancient alliance brought the Thessalians to the aid of Athens; those who came being the Larisaeans, Pharsalians, Cranonians, Pyrasians, Gyrtonians, and Pheraeans. The Larisaean commanders were Polymedes and Aristonus, two party leaders in Larisa; the Pharsalian general was Menon; each of the other cities had also its own commander.
In the meantime the Peloponnesians, as the Athenians did not come out to engage them, broke up from Acharnae and ravaged some of the demes between Mount Parnes and Brilessus. While they were in Attica the Athenians sent off the hundred ships which they had been preparing round Peloponnese, with a thousand heavy infantry and four hundred archers on board, under the command of Carcinus, son of Xenotimus, Proteas, son of Epicles, and Socrates, son of Antigenes. This armament weighed anchor and started on its cruise, and the Peloponnesians, after remaining in Attica as long as their provisions lasted, retired through Boeotia by a different road to that by which they had entered. As they passed Oropus they ravaged the territory of Graea, which is held by the Oropians from Athens, and reaching Peloponnese broke up to their respective cities.
After they had retired the Athenians set guards by land and sea at the points at which they intended to have regular stations during the war. They also resolved to set apart a special fund of a thousand talents from the moneys in the Acropolis. This was not to be spent, but the current expenses of the war were to be otherwise provided for. If any one should move or put to the vote a proposition for using the money for any purpose whatever except that of defending the city in the event of the enemy bringing a fleet to make an attack by sea, it should be a capital offence. With this sum of money they also set aside a special fleet of one hundred galleys, the best ships of each year, with their captains. None of these were to be used except with the money and against the same peril, should such peril arise.