The Peloponnesian War's Real Military Campaigns

Military History: The Greeks

Chapter 7 · The Peloponnesian War's Real Military Campaigns

Chapters 4–6 covered the Persian Wars, where Greek city-states fought a common outside enemy. This chapter turns to the war Greeks fought against each other — Athens and Sparta's own real, decades-long conflict — traced here through its actual campaigns and battles rather than its political causes.

A Real, Three-Phase War

Historians divide the Peloponnesian War (431–404 BCE) into three real, distinct military phases, each with its own genuinely different character.

Phase	Dates	Real Military Character
The Archidamian War	431–421 BCE	Sparta repeatedly invaded Attica by land; Athens used its naval superiority to raid the Peloponnesian coast instead of risking open battle
The Sicilian Expedition	415–413 BCE	A massive Athenian expeditionary force sent to conquer Syracuse — ending in total, catastrophic destruction
The Decelean (Ionian) War	413–404 BCE	Sparta occupied Decelica near Athens year-round and, funded by Persian money, built a real navy capable of challenging Athens at sea

Pylos & Sphacteria: Breaking a Myth (425 BCE)

During the Archidamian War's own stalemate, an Athenian force under Demosthenes fortified a position at Pylos on the Peloponnesian coast. A naval victory trapped a Spartan land force on the nearby island of Sphacteria — and after a siege, the Spartans surrendered.

A Genuinely Unprecedented Event Of 440 hoplites trapped on Sphacteria, 292 were captured, including 120 full Spartiates — a real, substantial fraction of Sparta's own small citizen-soldier class. Spartans were expected to fight to the death, never surrender, regardless of the odds. This real capitulation shattered that reputation across the Greek world and triggered a real wave of Spartan peace offers, directly contributing to the Peace of Nicias in 421 BCE.

The Sicilian Expedition: A Real, Total Disaster

In 415 BCE, Athens launched a massive expedition against Syracuse in Sicily — an initial force of 130 triremes and 5,000 hoplites, driven substantially by Alcibiades's own ambition and rhetorical persuasion.

The Herms Scandal

On the eve of departure, Athens's sacred Herm statues were found mutilated across the city. Alcibiades became the chief suspect and was recalled to stand trial.

Defection, Not Trial

Rather than face judgment, Alcibiades defected to Sparta — and gave the Spartans real, detailed intelligence on the expedition's own plans, urging them to send the capable general Gylippus to reinforce Syracuse.

Nicias's Failed Command

Left in sole command after Lamachus's death in battle and Alcibiades's defection, Nicias's own hesitant leadership let the siege stall while Syracuse's defenses, strengthened by Gylippus, grew stronger.

The Real, Total Cost In September 413 BCE, the Syracusans burned or sank the entire trapped Athenian fleet. The Athenian army's attempted overland retreat was cut off and destroyed; Nicias himself was executed. Real losses ran to at least 40,000 dead or captured — Athens's own single greatest military defeat of the entire war. Thousands of captured soldiers were sent to work in Syracuse's stone quarries, where they were starved and worked to death.

Looking Ahead

Chapter 8 covers Thebes's own real military innovation — Epaminondas's oblique-order tactic at Leuctra in 371 BCE, the battle that finally broke Spartan dominance for good.

Reflect

Question 1 Sparta's surrender at Sphacteria shattered a real, long-held reputation for never yielding. What does this suggest about how a single battlefield event can undo a reputation built over generations?

Question 2 Alcibiades's own personal scandal and defection directly reshaped the Sicilian Expedition's outcome. What does this suggest about the risk of tying a major military campaign's own success to one individual leader?

Question 3 Athens committed a genuinely massive force to Sicily, far from the war's main theater. What might this decision suggest about the dangers of military overreach even for a well-resourced power?

Chapter 7 Quick Reference

431–421 BCE: The Archidamian War — Spartan land invasions against Athenian naval raiding
425 BCE: Pylos & Sphacteria — a real, unprecedented Spartan surrender (292 captured, 120 full Spartiates)
415–413 BCE: The Sicilian Expedition — Athens's catastrophic attempt to conquer Syracuse
Alcibiades: Recalled over the Herms scandal, defected to Sparta, and gave real intelligence against his own former army
Real outcome: At least 40,000 Athenian dead or captured — Athens's single greatest defeat of the war
413–404 BCE: The Decelean/Ionian War — Sparta builds a Persian-funded navy to finish the war at sea