History of the Peloponnesian War

But the contrary faction to the traitors being superior in number, whereby the gates were not opened presently, both they and Eucles the general, who was then there for the Athenians to keep the town, sent unto the other general, Thucydides, the son of Olorus, the writer of this history, who had charge in Thrace, and was now about Thasos (which is an island and a colony of the Parians, distant from Amphipolis about half a day's sail), requiring him to come and relieve them.

When he heard the news, he went thitherwards in all haste with seven galleys, which chanced to be with him at that time. His purpose principally was to prevent the yielding up of Amphipolis; but if he should fail of that, then to possess himself of Eion [before Brasidas' coming].