On the back of reading Thucydides’ History of the Peloponnesian War and Xenophon’s Hellenika, I wanted to create an interactive timeline of the generation-long conflict that defined the classical era.
While presentations like The Landmark Thucydides help, this is a conflict that really benefits from spatial/temporal visualization that highlights the shifting theaters of the war and the moves and countermoves of the two sides.
What follows is an interactive atlas of the war. Use the timeline to move through a period of building tension followed by the 27 years of the conflict. Events will appear on the map as they happen, and you can click any marker for more information on a battle, siege, or significant political event. Territory shading shows the rough alignment of the Greek world at each phase of the conflict.
- Blue shading and markers indicate Athens and its allies; red indicates Sparta and its allies
- Dashed lines trace major campaign routes
- Click any event marker for details; nearby events can be paged through
- Use the play button or drag the timeline to advance through the years
Loading map of the ancient Greek world…
The war is conventionally divided into three phases, each with its own character and theaters of operation.
The first phase of the war takes its name from Spartan King Archidamus II, who led the initial invasions of Attica. The pattern was set in the first year of the war: Sparta would invade by land while Athens withdrew behind the Long Walls and struck back by sea.
Pericles had a strategy of avoiding pitched battles on land and maintaining naval supremacy until Sparta eventually exhausted itself.
This strategy might have worked if not for the plague of 430 BCE, which killed maybe a quarter of the population including Pericles himself in 429. Without his leadership, Athenian politics turned to hawkish demagogues like Cleon who pushed for aggressive actions and blocked early attempts at a negotiated peace.
A turning point came at Pylos in 425, where the Athenian general Demosthenes fortified a headland on Sparta’s own coast. In their attempt to repulse the Athenians, a group of Spartan hoplites were trapped on the island of Sphacteria. Athens was able to force the surrender of these Spartiates, taking them prisoner. This gave Athens a powerful position to negotiate for peace, but Athens pushed for more expansive aims.
Brasidas, a gifted Spartan commander, countered by marching north to threaten the Chalcidice and captured Amphipolis, Athens’ most valuable northern ally. Brasidas and Cleon died at the Battle of Amphipolis, removing the leader of the war party on each side and setting the stage for the Peace of Nicias which followed in 421.
The peace was fragile from the start, with most of Sparta’s allies including Corinth refusing to accept its terms. The young Alcibiades, an ambitious figure who would play a prominent role in the remaining phases of the war, engineered an anti-Spartan coalition with Argos, who was coming off its own truce with Sparta. This led to the Battle of Mantinea, the biggest land battle of the war, and a significant Spartan victory that did much to restore the self-confidence lost after Pylos and Sphacteria.
During this peace, Athenian imperial ambitions continued, with the conquest of neutral Melos giving us the famous Melian Dialogue in Thucydides that still resonates 2,400 years later:
Athenians: For ourselves, we shall not trouble you with specious pretences—either of how we have a right to our empire because we overthrew the Mede, or are now attacking you because of wrong that you have done us—and make a long speech which would not be believed; and in return we hope that you, instead of thinking to influence us by saying that you did not join the Lacedaemonians, although their colonists, or that you have done us no wrong, will aim at what is feasible, holding in view the real sentiments of us both; since you know as well as we do that right, as the world goes, is only in question between equals in power, while the strong do what they can and the weak suffer what they must.
Athens then committed to one of the great roll of the dice in history, launching the largest military operation in Greek history to this point, with an expedition to Sicily. This expedition could very plausibly have had a different outcome, prompting some very interesting counterfactuals.
Early on Alcibiades, the main instigator of the invasion, was recalled to face trial in Athens and defected to Sparta instead. Athens seems to have caught Syracuse unprepared but the Athenian commander Nicias did not seize the initiative. Instead Athens got bogged down in a siege that featured ancient combat engineering as walls raced counter-walls. As things dragged on for two years, Athens sent reinforcements under Demosthenes, which also got trapped after the expedition leader Nicias did not listen to advice telling him to withdraw. The entire Athenian force was destroyed, 200 ships lost and thousands were killed or enslaved as they tried to retreat via land.
The final phase of the war saw things shift permanently in Sparta’s favor. On Alcibiades’ advice, Sparta fortified Decelea in Attica, which gave them a permanent garrison that denied Athens access to its countryside all year round.
With the loss of the fleet in Sicily, Athens faced a wave of revolts across the Aegean as allies tried to shake off the tribute imposed by the Delian League. Finally Persia saw an opportunity and began funding Sparta and bankrolling the Spartan fleet. Sparta, under a rallying cry of ‘Freedom for the Greeks’, was prepared to sell out the Greek cities in Asia Minor if it meant it could check Athens.
The primary theatre once again shifted, with the action in the final stages of the war occurring in the eastern Aegean as both sides fought for naval supremacy and control of the Black Sea grain route.
With its back against the wall, Athens was to display some impressive resilience and put together a new fleet that allowed it to win a series of naval victories — Cynossema, Cyzicus, and Arginusae — which gave it a favorable position to negotiate a peace, that it declined to take twice. Alcibiades had defected from Sparta to the Persian court, after a rumored dalliance with the Spartan queen, before finally returning to support the Athenian side and leading a campaign in the Bosporus and Propontis which kept open the crucial grain supply route from the Black Sea.
Despite the defeats at Cyzicus and Arginusae, Sparta with Persian gold was able to assemble another fleet of sufficient size to threaten Athens. Lysander, Sparta’s most capable admiral, managed to sail into the Bosporus and fortify a base from which he could cut off naval traffic. This forced Athens to respond, and after Athens repeatedly offered and was declined a set-piece battle, Lysander caught the Athenian fleet on the beach. This ‘battle’ of Aegospotami in 405 resulted in the capture of nearly all of the Athenian fleet. With no ships, no allies, and no grain coming from the Black Sea, Athens finally surrendered in 404 after being blockaded by land and sea.
Spartan victory was absolute, but they did not listen to voices calling for the complete destruction of Athens. Instead they tore down the Long Walls to the port of Piraeus, ended the Delian League and installed a puppet regime of thirty tyrants. This resulted in a short-lived Spartan hegemony over Greece, but Sparta completely mishandled the peace and was itself defeated in future wars that I will cover in a separate blog post.