History of the Peloponnesian War

On the return of the Peloponnesians from Attica, the Spartans themselves and the nearest of the Perioeci immediately went to the rescue of Pylus; but the other Lacedaemonians were more slow in marching against it, as they had but just reached home from a different expedition.

They despatched orders also through the rest of the Peloponnese to bring up their reinforcements to Pylus as quickly as possible and sent for their sixty ships at Corcyra. These having been hauled over the isthmus of Leucas, and having so escaped the observation of the Athenian fleet at Zacynthus, reached Pylus; the land-forces also having by that time arrived.

While the Peloponnesians were yet sailing up, Demosthenes anticipated them by secretly sending two ships with a message to Eurymedon and the Athenians on board the fleet at Zacynthus to join him, as the place was in danger.

So the ships sailed with all speed, according to the orders of Demosthenes; while the Lacedaemonians prepared to assault the place both by land and sea, hoping easily to take a building completed in haste, and with only a few men in it.