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Sicilian Expedition

Athenian military expedition to Sicily during the Peloponnesian War (415–413 BC)

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Destruction of the Athenian army at Syracuse
John Steeple Davis · Public domain

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The expedition was hampered from the outset by uncertainty over its objectives and command structure. Political manoeuvring in Athens expanded an originally modest force of twenty ships into a massive armada, while the expedition's principal advocate, Alcibiades, was recalled to Athens to stand trial before the fleet had even reached Sicily. Despite these setbacks, the Athenians achieved early successes. Syracuse, the most powerful state in Sicily, responded slowly to the threat and was nearly surrounded and besieged before the arrival of reinforcements under the Spartan general Gylippus, who galvanised the city's resistance. Thereafter, the Athenians gradually lost the initiative. Although a large reinforcing armada from Athens briefly restored their advantage, a disastrous assault on a strategic high point and a series of crippling naval defeats undermined both their military effectiveness and morale. A final attempt to evacuate the army failed, and nearly the entire expeditionary force was killed, captured, or sold into slavery.

The consequences of the defeat were immense. Two hundred ships and thousands of soldiers, a significant portion of Athens' military resources, were lost in a single campaign. The disaster encouraged Athens' enemies in mainland Greece and Persia to intensify their efforts against the city, while revolts broke out among Athenian allies in the Aegean. Some historians regard the expedition's failure as the turning point of the war, although Athens continued fighting for another decade. Thucydides observed that contemporaries were astonished not that Athens eventually lost the war, but that it was able to continue fighting for so long after suffering such catastrophic losses. Although Athens rebuilt much of its fleet, the loss of experienced soldiers and sailors proved far more difficult to replace.

Background

Athens and Sicily

Although Athens had never involved itself deeply in Sicilian affairs, it had ties there before the onset of the Peloponnesian War, dating back to at least the mid-5th century BC. To small Sicilian cities, Athens was a potential counter to the powerful city of Syracuse, which was strong enough to potentially dominate the island. Syracuse, like Sparta and its Peloponnesian allies, was a Dorian city, while most of Athens's allies on the island were Ionian. Another source of conflict was the close relationship of Syracuse and other Dorian cities of the west to Athens's great commercial rival, Corinth. To the Athenians, Sicily was a threat—an unencumbered Syracuse might send grain or other aid to the Peloponnesians—as well as a venue for possible conquests.

In 427 BC, Athens had sent twenty ships, under the command of Laches, in response to an appeal for help from Leontini. That expedition, operating from a base at Rhegium, remained in the area for several years, fighting alongside Athens's local allies against the Syracusans and their allies, without achieving any dramatic successes. In 425, the Athenians planned to reinforce their contingent with an additional forty triremes, but that fleet never reached Sicily, as it became caught up in the pivotal Battle of Pylos on the way there. By the time that fleet reached Sicily in late summer, Athens's Sicilian allies had grown weary of stalemated warfare, and agreed to negotiate with Syracuse and its allies. At the Congress of Gela, the Sicilian cities made peace on the basis of "Sicily for the Sicilians", and the Athenian fleet left for home.

State of the war

In 415, Athens and Sparta had been formally at peace since 421, when the Peace of Nicias had brought the Archidamian War to a close. The terms of that peace, however, had never been fulfilled; Sparta had never surrendered Amphipolis to Athens, as required by the treaty, and in return the Athenians had held Pylos. More recently, Athenian and Spartan troops had fought at the Battle of Mantinea in 418, with Athens supporting Argos, Mantinea, and other Peloponnesian cities in an attempt to establish a stable anti-Spartan alliance in the Peloponnese. That attempt, largely orchestrated by the Athenian nobleman Alcibiades, would have destroyed Sparta's control over the Peloponnesian League had it succeeded. Alcibiades rebounded politically from this defeat, and was elected as a general in the spring of 417. Control of Athens' foreign policy remained divided between a "peace party" (or pro-Spartan party) led by Nicias, and a "war party" led by Alcibiades.

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