The Peloponnesian War (431–404 BC)[2] was an ancient Greek war fought between the Delian League, which was led by Athens, and the Peloponnesian League, which was led by Sparta.
Historians have traditionally divided the war into three phases.
In the first phase, the Archidamian War, Sparta launched repeated invasions of Attica, while Athens took advantage of its naval supremacy to raid the coast of the Peloponnese and attempt to suppress signs of unrest in its empire.
This period of the war was concluded in 421 BC, with the signing of the Peace of Nicias. That treaty, however, was soon
