History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
The Syracusan ships pursued them as far as the merchantmen, where they were stopped by the beams armed with dolphins suspended from those vessels over the passage.
Two of the Syracusan vessels went too near in the excitement of victory and were destroyed, one of them being taken with its crew.