History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
Some hurried to Delium and the sea-coast, others towards Oropus, others to Mount Parnes, and others as they severally had hope of saving themselves.
The Boeotians, in the mean time, were pursuing them close, and putting them to the sword, especially the cavalry, both their own and the Locrian, which came to their succour just as the rout took place: but the mass of the fugitives escaped more easily than they would else have done, in consequence of night coming on before the business was over.
The next day, the troops at Oropus and those at Delium, having left a garrison in it, (for they still continued to hold it notwithstanding,) returned home by sea.