Cornelius Nepos,
Lives of the Eminent Commanders…
“ But Phocion fell into a massive crime, because when the highest command of the people was invested in him and he was warned by Dercylus that Nicanor, the prefect of Cassander, was planning to attack the Piraeus of the Athenians and Dercylus asked him to ensure that the community was not stripped of its supply route, Phocion denied that there was any danger, in an assembly of the people, and promised that he himself would be a surety of this thing. But not much later, Nicanor made himself master of the Piraeus, without which Athens was utterly unable to exist. ”
