From N.S. Gill,
Your Guide to Ancient / Classical History.
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Definition: Thucydides (born c. 460-455 B.C.) had first hand information about the Peloponnesian War from his pre-exile days as an Athenian commander. During his exile he interviewed people on both sides and recorded their speeches in his History of the Peloponnesian War. Unlike his predecessor, Herodotus, he didn't delve into the background but laid out the facts as he saw them, chronologically or annalistically.
See John Porter's Class Notes on Thucydides (Accessed 6/15/2006)
Francis M. Cornford, Thucydides Mythistoricus