The Sicilian Expedition: How Athens Lost the Peloponnesian War

In 415 BC, Athens embarked on a significant military campaign to Sicily, intending to support its allies Leontini and Segesta against Syracuse. This initiative, which sparked debate between Alcibiades and Nicias in the Athenian assembly, transformed from a minor operation into a large-scale effort when Nicias inadvertently expanded the fleet. The mission faced numerous challenges, including sacrilege (the mutilation of Herms) and Alcibiades' defection to Sparta. Although initial victories were achieved, the siege of Syracuse faltered as Spartan reinforcements led by Gylippus changed the situation. A relief attempt by Demosthenes failed at Epipolae, and a lunar eclipse delayed their retreat, culminating in a naval defeat in the Great Harbor. The subsequent land retreat resulted in the loss of 18,000 lives, 7,000 captures, and the execution of generals Nicias and Demosthenes, costing Athens hundreds of ships and tens of thousands of soldiers, thus transforming the Peloponnesian War into a struggle for survival.