History of the Peloponnesian War

Upon their return, presently the truce at Pylus was at an end; and the Lacedaemonians, according to agreement, demanded restitution of their galleys. But the Athenians, laying to their charge an assault made upon the fort, contrary to the articles, and other matters of no great importance, refused to render them, standing upon this, that it was said that the accord should be void upon whatsoever the least transgression of the same. But the Lacedaemonians, denying it and protesting this detention of their galleys for an injury, went their ways and betook themselves to the war.

So the war at Pylus was on both sides renewed with all their power; the Athenians went every day about the island with two galleys, one going one way, another another way, and lay at anchor about it every night with their whole fleet, except on that part which lieth to the open sea; and that only when it was windy. (From Athens also there came a supply of thirty galleys more, to guard the island, so that they were in the whole threescore and ten.) And the Lacedaemonians made assaults upon the fort, and watched every opportunity that should present itself to save their men in the island.