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 end of it was that Hagnon returned with his ships to Athens, having lost one thousand and fifty out of four thousand heavy infantry in about forty days; though the soldiers stationed there before remained in the country and carried on the siege of Potidaea.
After the second invasion of the Peloponnesians a change came over the spirit of the Athenians. Their land had now been twice laid waste; and war and pestilence at once pressed heavy upon them.