The advantage that Athens had during the Peloponnesian wars was that they had a bigger army. They also had a larger Navy.
Sparta .
During the Peloponnesian war.
Sicily.
By sea.
plato
Athens won the first Peloponnesian War but Sparta won the second war
Athens and its allies were defeated by Sparta in the Peloponnesian War.
. . . the Peloponnesian War .
Athens and Sparta
Athens and Sparta fought in the Peloponnesian War.
The city-state of Athens and its allies were defeated by Sparta in the Peloponnesian War.
Contrast the results of the Persian and Peloponnesian war with regards to Athens Greece