Thucydides did not set out to be a theorist in his account of the Peloponnesian War. Rather, his analysis of the great war between Athens and Sparta helps to clarify not only the events of that war but also fundamental, theoretical truths about the nature and consequences of human conflict.
"Thucydides: Theorist of War,"
Naval War College Review: Vol. 66
, Article 5.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol66/iss4/5