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 once they had determined upon the scheme they set to work immediately. Reaching Nisaea at night they launched the ships and sailed, not now to the Peiraeus as they had intended, since they were appalled by the risk—and a wind, too, is said to have prevented them—but to the promontory of Salamis that looks towards Megara. There was a fort here and a guard of three ships to prevent anything from entering or leaving the harbour of the Megarians. This fort they assaulted, towed away the triremes without their crews, and ravaged the rest of Salamis, falling on the inhabitants unawares.
Meanwhile fire-signals indicating a hostile attack were flashed to Athens, where a panic was caused as great as any in this war.[*](This must refer to the so-called Decelean War (or last ten years of the Peloponnesian War), for in Thuc. 8.96.1 we read that a panic occurred greater than any before (τοῖς Ἀθηναίοις ... ἔκπληξις μεγίστη δὴ τῶν πρὶν παρέστη).)For the inhabitants of the city thought that the enemy had already entered the Peiraeus, and those of the Peiraeus that they had taken Salamis and were all but sailing into their own harbour-as indeed might easily have happened if the enemy had resolved that there should be no flinching;
and no mere wind would have prevented them. But at dawn the Athenians hastened down to the Peiraeus with all their forces, launched ships, and embarking in haste and with much confusion sailed with the fleet to Salamis, setting their landforces to guard the Peiraeus.
The Peloponnesians had already overrun most of Salamis and had taken prisoners and booty and the three ships at the fort of Budorum, when they saw the relief expedition coming, whereupon they sailed in haste toward Nisaea; to some extent too there was apprehension about their own ships, which had not been drawn down into the sea for a long time and were anything but water-tight.
On reaching Megara they withdrew on foot to Corinth, and the Athenians, finding them no longer at Salamis, likewise sailed back. After this they kept stricter guard over the Peiraeus, closing up the harbour[*](i.e. by prolonging the walls at the entrance so as to leave only a narrow passage in the centre, which could be closed by a chain.) as well as taking other precautions.
About the same time, at the beginning of this winter, Sitalces the Odrysian, a son of Teres, king of the Thracians, made an expedition against Perdiccas son of Alexander, king of Macedonia, and against the Chalcidians of Thrace, wishing to exact fulfilment of one promise and to make good another.