History of the Peloponnesian War

The Mytilenaeans, however, were informed of the expedition against them by a man who crossed over from Athens to Euboea, and having gone by land to Geraestus, there found a merchant-vessel getting under weigh, and so proceeded by sea, and arrived at Mytilene the third day after leaving Athens. Accordingly they both abstained from going out to the temple at Malea, and, for the rest, barricaded and kept guard around their half-finished walls.

When the Athenians sailed up soon after and saw this, the commanders delivered their orders; and as the Mytilenaeans did not obey them, they commenced hostilities.