History of the Peloponnesian War

When they came to the river, here also they found a certain guard of the Syracusians stopping their passage with a wall and with piles. When they had quickly forced this guard, they passed the river and again marched on to another river, called Erineus; for that was the way which the guides directed them.

In the meantime the Syracusians and their confederates, as soon as day appeared and that they knew the Athenians were gone, most of them accusing Gylippus as if he had let them go with his consent, followed them with speed the same way, which they easily understood they were gone, and about dinner time overtook them.

When they were come up to those with Demosthenes, who were the hindmost and had marched more slowly and disorderly than the other part had done, as having been put into disorder in the night, they fell upon them and fought. And the Syracusian horsemen hemmed them in and forced them up into a narrow compass, the more easily now because they were divided from the rest.