Sicilian Expedition

The Sicilian Expedition was a massive military mission launched by the city-state of Athens. It occurred between 415 and 413 BC during the Peloponnesian War. This war was a long struggle between Athens and a coalition led by Sparta. The expedition was intended to send Athenian forces to the island of Sicily. Athens wanted to support its ally, the city of Segesta, which was fighting a war against Selinus.

Athens had several reasons for looking toward Sicily. The city of Syracuse was the most powerful state on the island. Syracuse was a Dorian city, which meant it had ties to Sparta and Corinth. Athens was worried that a powerful Syracuse might send grain or aid to the Peloponnesians. Athens also saw Sicily as a place for possible conquest. In the decades before this mission, Athens had already sent small forces to Sicily to help local allies.

Before the fleet sailed, the Athenian assembly held intense debates. The leaders were divided into two main political factions. Nicias led the "peace party," which was cautious and pro-Spartan. Alcibiades led the "war party," which was more aggressive. Nicias argued that the expedition was too risky and expensive. He warned that Athens would be fighting enemies that were too difficult to rule. He also claimed that Alcibiades was an inexperienced leader seeking personal glory.

Alcibiades responded by defending his record of service to Athens. He argued that the city had a duty to help its Sicilian allies. He also believed the expedition would expand the Athenian empire. To stop the plan, Nicias used a clever tactic during the debate. He suggested that the expedition should be even larger and more expensive than originally planned. He hoped the high cost would scare the citizens. Instead, the assembly enthusiastically approved a massive force. They authorized over 100 ships and 5,000 hoplites, which were heavy infantry soldiers.

Just before departure, a strange event occurred in Athens. Someone destroyed many hermai, which were stone markers of the god Hermes. These markers were used for good luck. Many Athenians saw this as a bad omen for the voyage. Political enemies of Alcibiades used the event to accuse him of a conspiracy. While the fleet was at sea, his opponents brought him to trial. This left the Athenian command in a state of uncertainty from the very beginning.

At first, the Athenians achieved significant success in Sicily. They almost completely invested Syracuse, which means they surrounded the city. However, the Syracusans eventually received reinforcements from a Spartan general named Gylippus. Gylippus helped motivate the people of Syracuse to fight back. This changed the momentum of the conflict. The Athenians lost the initiative and began to lose control of the situation.

The situation for the Athenians turned from difficult to disastrous. They suffered several crippling naval defeats at sea. They also failed a major assault on a strategic high point. These losses damaged the morale of the soldiers and their ability to fight. The Athenians eventually attempted a desperate evacuation to escape Syracuse. This attempt failed completely. Nearly the entire expeditionary force was either captured or destroyed.

The scale of the defeat was immense for the city of Athens. In a single event, they lost 200 ships and thousands of soldiers. This represented a huge portion of Athens' total manpower. The defeat encouraged Athens' enemies in Persia and on the mainland to take action. It also led to various rebellions in the Aegean Sea. Many historians believe this was the turning point of the Peloponnesian War. While Athens continued to fight for another ten years, the loss of men was a blow they could not easily fix.