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.
But Pasitelidas, the Lacedaemonian commander, and the garrison that was present came to the defence of this wall and tried to ward off the Athenian assault. But they were hard pressed and the ships that had been sent round were now sailing into the harbour; so Pasitelidas, in fear that the ships might take the town, undefended as it was, before he could get there, and that if the new fortifications were carried he might be captured in them, left them and hurried back into the town.
But the Athenians from the ships forestalled him and took Torone, and their land-force, following close upon him, at the first assault dashed in with him at the breach in the old wall. And they slew some of the Peloponnesians and Toronaeans on the spot in hand to hand fighting, but others they took alive, including Pasitelidas the commander.
Brasidas meanwhile was coming to the relief of Torone, but learning on the road that it had fallen he retreated, having missed getting there in time by just about forty stadia.