History of the Peloponnesian War

Word was also sent round Peloponnese to come up as quickly as possible to Pylos; while the sixty Peloponnesian ships were sent for from Corcyra and being dragged by their crews across the isthmus of Leucas, passed unperceived by the Athenian squadron at Zacynthus, and reached Pylos, where the land forces had arrived before them.

Before the Peloponnesian fleet sailed in, Demosthenes found time to send out unobserved two ships to inform Eurymedon and the Athenians on board the fleet at Zacynthus of the danger of Pylos and to summon them to his assistance.