Description:The seeds of the Peloponnesian War (431–404 bc), fought between the
city-states of Sparta and Athens and their respective allies, were sown some
50 years earlier through the successes of the Greek states in defeating the
second Persian invasion of Greece (480–479 bc). Eleven years previously,
at the culmination of the first Persian invasion of Greece (490 bc), Athens
stood alone at the battle of Marathon; this unexpected Athenian victory
encouraged the city-state to see itself as Sparta’s equal. Sparta had always
been considered to be the ‘natural’ leader of Greece because of its unique
political system which meant Spartan citizens trained in warfare full time.
Other Greek city-states had citizen soldiers with minimal training who
were called out as needed.