History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
And they captured two of the Peloponnesian ships, which fell in with them at that moment, having put out into the open sea too boldly in their pursuit. A day later they reached Elaeus and cast anchor; then they brought thither the ships at Imbros that had taken refuge there and spent the next five days preparing for the battle.
When that time had elapsed they began the battle in the following manner. The Athenians, arrayed in single column, were sailing close in to sore in the direction of Sestus, when the Peloponnesians, observing their movements from Abydus, went out to meet them.
When they both realised that a battle was imminent, the Athenians, with seventy-six ships, extended their line parallel with the shore of the Chersonesus, from Idacus to Arrhiana, while the Peloponnesians, with eighty-six ships, extended theirs from Abydus to Dardanus.