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.
About the same time the Argives invaded the territory of Phlius and lost eighty men cut off in an ambush by the Phliasians and Argive exiles.
Meanwhile the Athenians at Pylos took so much plunder from the Lacedaemonians that the latter, although they still refrained from breaking off the treaty and going to war with Athens, yet proclaimed that any of their people that chose might plunder the Athenians.