Difficulty of subsistence made the invaders reduce the numbers of the army to a point at which it might live on the country during the prosecution of the war.
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About Thucydides
Thucydides was 5th-century bc athenian historian and general. Thucydides was an Athenian historian and general. His History of the Peloponnesian War recounts the fifth-century BC war between Sparta and Athens until the year 411 BC. Read more on Wikipedia →