431-411 Thucydides.
411-404 Xenophon.
The war was called ''the peloponnesian war''. The wikipedia page has very acurate info. The book of the Athenian historian Thucydides ''History of the Peloponnesian War'' is the main source of information.(there are many good translations)
A contest between the Athenian empire and the Peloponnesian League led by Sparta, with Athenian expansionism facing Peloponnesian determination to give no further ground to it.
A struggle between the Athenian empire/league and the Spartan-led Peloponnesian League.
A struggle between the Athenian empire and the Peloponnesian League led by Sparta.
Irreconcilable differences between the Peloponnesian League over the Athenian ban of trade with the Peloponnesian city of Megara, designed to cripple it.
We call it today the Peloponnesian War. It was a 27-year war between the Athenian Empire and the Peloponnesian League led by Sparta.
It ran for 27 years between the Athenian empire and the Peloponnesian League led by Sparta 431 to 404 BCE.
Wars don't have roles. They happen and have outcomes. The Peloponnesian War was between the Athenian empire and the Peloponnesian League, which Athens lost and lost its empire.
It was a conflict between two alliances - the Athenian empire and the Peloponnesian League led by Sparta over dominance in parts of the Greek world.
Thucydides was a famous Greek Historian. He was writing in the 5th century and focuses on the Peloponnesian War between Athens and Sparta.
Rivalry between the Athenian empire and the Peloponnesian League led by Sparta, culminating in Athens imposing a ruinous trade ban on the Peloponnesian city of Megara and refusing to rescind it.
Athens' expansionist activities were opposed by the Peloponnesian League headed by Sparta. Continuing Athenian pressure on cities outside its empire resulted in a series of clashes which led to war between the two power blocs.