The advantage that Athens had during the Peloponnesian wars was that they had a bigger army. They also had a larger Navy.
a larger navy
During the Peloponnesian war.
Sparta .
plato
Sicily.
By sea.
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