History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
At the very beginning of summer the Peloponnesians and their[*](430 B.C.) allies, with two-thirds of their forces as before[*](Thuc. 2.10.2.) invaded Attica, under the command of Archidamus, son of Zeuxidamus, king of the Lacedaemonians, and establishing themselves proceeded to ravage
the country. And before they had been many days in Attica the plague[*](It is perhaps impossible to identify the plague of Athens with any known disease. Grote describes it as an eruptive typhoid fever. It has perhaps more symptoms in common with typhus than with any other disease.) began for the first time to show itself among the Athenians. It is said, indeed, to have broken out before in many places, both in Lemnos and elsewhere, though no pestilence of such extent nor any scourge so destructive of human lives is on