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.
Since, however, they would not yield he marched at once against Torone,[*](The chief town on the Sithonian peninsula.) in Chalcidice, which was held by the Athenians; for a few men, who were ready to betray the town, had invited him over. Arriving with his army toward dawn, but while it was still dark, he encamped near the temple of the Dioscuri, which is about three stadia distant from the city.
The rest of the town of Torone and the Athenians of the garrison were unaware of his approach, but his partisans, knowing that he would come, and some few of them having secretly gone forward to meet him, were watching for his approach; and when they perceived that he was there, they introduced into the town seven light-armed men with daggers, under the command of Lysistratus an Olynthian, these men alone of the twenty first assigned to the task not being afraid to enter. These slipped through the seaward wall and escaping the notice of the guard at the uppermost watch-post of the town, which is on the slope of a hill, went up and slew these sentinels, and broke open the postern on the side towards the promontory of Canastraeum.
Meanwhile Brasidas, having gone forward a little, kept quiet with the rest of his army, but sent forward one hundred targeteers, in order that as soon as any gates were opened and the signal agreed upon was raised they might rush in first.
These now, as time elapsed, were wondering at the delay and had come up little by little close to the town. Meanwhile the Toronaeans inside who were co-operating with the party which had entered, when the postern had been broken down and the gates near the market-place had been opened by cutting the bar, first brought some men around to the postern and let them in, in order that they might take the townsmen unawares by a sudden attack in their rear and on both sides and throw them into a panic; after that they raised the fire-signal agreed upon and received the rest of the targeteers through the gates near the market-place.
Brasidas, on seeing the signal, set off at a run, calling up his force, and they with one voice raised a shout and caused great dismay to the townsmen.