Introduction to the Archidamian War (431-420 BC)

Welcome to your study of the first decade of the Great Peloponnesian War! This period is known as the Archidamian War, named after the Spartan King Archidamus II. It was a time of high tension, innovative strategies, and unexpected disasters that changed the Greek world forever. In this chapter, we will look at how two superpowers—Athens (the naval empire) and Sparta (the land power)—tried to break a stalemate. We will explore everything from a terrifying plague to a daring commando-style raid at Pylos. Don't worry if the names seem a bit overwhelming; we will break down the "who's who" and "what happened" step-by-step. Quick Context: This war followed the breakdown of the Thirty Years' Peace. If you need a refresher on why the war started, check the "Peace and Conflict 446-431 BC" notes.

1. Clash of Strategies: The "Island" vs. The "Invasion"

At the start of the war, both sides had very different ideas about how to win.

The Athenian Strategy (The "Periclean" Plan)

The leader Pericles knew Athens couldn't beat Sparta in a traditional land battle. His strategy, recorded by Thucydides, was:
  • Abandon the countryside: All Athenians living in rural Attica moved inside the "Long Walls" that connected the city to its port, Piraeus.
  • Avoid land battles: Don't fight the Spartans on their own terms.
  • Rely on the Navy: Use the fleet to protect food imports and launch "hit and run" raids on the Peloponnese.
  • Keep the Empire tight: Don't try to expand the empire while at war.

The Spartan Strategy (The "Archidamian" Plan)

The Spartans, led by Archidamus, used the traditional Greek way of fighting:
  • Annual Invasions: Every year, the Spartan army would march into Attica and burn crops and farmhouses.
  • Pressure to Fight: They hoped that by destroying Athenian property, they would provoke the Athenians to come out and fight a land battle.
  • Encourage Revolts: They wanted to encourage Athens' allies to rebel against their "tyrant" city.
Key Takeaway: It was a "Whale vs. Elephant" scenario. The whale (Athens) ruled the sea, and the elephant (Sparta) ruled the land. Neither could easily reach the other's "territory."

2. The Invasions of Attica and the Great Plague

As Pericles predicted, the Spartans invaded Attica in 431 BC. The Athenians watched from their city walls as their farms burned. However, something happened that Pericles did not predict: The Plague.

The Plague of Athens (430-427 BC)

Because everyone was packed inside the city walls for safety, disease spread like wildfire.
  • The Impact: Thucydides provides a famous, gruesome description of the symptoms and the breakdown of law and order. People stopped caring about religion or laws because they expected to die.
  • The Death of Pericles: Athens lost its greatest leader to the plague in 429 BC. This led to a "leadership vacuum" where more aggressive politicians like Cleon took power.
  • Aristophanes’ Connection: In his play Acharnians, the playwright Aristophanes shows the frustration of the rural farmers who were stuck in the city and just wanted peace.

3. Pylos and Sphacteria (425 BC): The Turning Point

For years, the war was a stalemate. Then, a bold move changed everything.

The Occupation of Pylos

An Athenian general named Demosthenes (not the orator!) got stuck at Pylos (on the coast of the Peloponnese) due to bad weather. He decided to fortify the spot, which was deep in Spartan territory and perfect for encouraging Helot (Spartan slave) revolts.

The Siege of Sphacteria

Sparta was so panicked that they sent a fleet and soldiers to the nearby island of Sphacteria. However, the Athenians managed to trap the Spartan soldiers on the island.
  • The Outcome: In a shock to the entire Greek world, 292 Spartans (including 120 elite Spartiates) surrendered rather than dying in battle.
  • The Result: Athens used these prisoners as "human shields." They told Sparta: "If you invade Attica again, we will kill the prisoners." This ended the annual Spartan invasions!
  • Cleon’s Fame: The politician Cleon took the credit for this victory, making him the most powerful man in Athens.

4. Brasidas in Thrace (424-422 BC)

Sparta needed a new plan to get their prisoners back. A charismatic Spartan general named Brasidas came up with a brilliant, unconventional idea.

Moving the War North

Instead of attacking Athens directly, Brasidas marched a small army (including freed Helots) all the way to Thrace and Chalcidice in the north.
  • Why Thrace? This was where Athens got its timber (for ships) and silver (for money).
  • Amphipolis: Brasidas captured the key Athenian colony of Amphipolis. This was a massive blow to Athens. (In fact, Thucydides was the general who failed to save it, which is why he was exiled and had time to write his history!)
  • The End of the Generals: In 422 BC, the Athenians tried to retake Amphipolis. In the battle, both Brasidas (the Spartan hero) and Cleon (the Athenian leader) were killed.
Key Takeaway: With the two main "war-hawks" (Brasidas and Cleon) dead, both sides were finally ready to talk about peace.

5. The Peace of Nicias (421 BC)

Named after the Athenian general Nicias, who preferred diplomacy to fighting, this was supposed to be a 50-year peace.

Key Terms of the Peace:

  • Both sides were supposed to give back the land and cities they had captured (Athens to give back Pylos; Sparta to give back Amphipolis).
  • The Spartan prisoners from Sphacteria were returned to Sparta.
  • The Problem: The allies of Sparta (like Corinth and Thebes) hated the treaty because it didn't give them what they wanted. They refused to sign it.

The Failure of the Peace

The "Peace" was more like a "Cold War."
  • Sparta couldn't force its allies to give back Amphipolis.
  • Athens refused to give back Pylos until they got Amphipolis back.
  • The Spartan-Athenian Alliance: In a strange twist, Athens and Sparta actually signed a defensive alliance to protect each other from revolts. This made Sparta's Peloponnesian allies even angrier.
Note: You can read about the comedy of this era in Aristophanes’ play "Peace", where a character flies to heaven on a giant dung beetle to bring "Peace" back to Earth!

Quick Review: Key Events Timeline

  • 431 BC: War begins; first invasion of Attica.
  • 430 BC: The Plague hits Athens.
  • 429 BC: Death of Pericles.
  • 425 BC: Athenian victory at Pylos and Sphacteria.
  • 424 BC: Brasidas begins his campaign in Thrace.
  • 422 BC: Battle of Amphipolis; deaths of Cleon and Brasidas.
  • 421 BC: Peace of Nicias signed.

Common Mistakes to Avoid

  • Mixing up the Demosthenes: Don't confuse the general Demosthenes (at Pylos) with the famous orator who lived much later.
  • Thinking the war ended in 421 BC: It didn't! The Peace of Nicias was very unstable and only lasted a few years before full-scale fighting broke out again.
  • Ignoring the Allies: Remember that Sparta wasn't just fighting for itself; it had to keep its allies (Thebes, Corinth, Megara) happy, which often dictated its policy.
What's Next? In the next chapter, we will see how this shaky peace completely fell apart, leading to the disastrous Sicilian Expedition and the final stage of the war.