Peloponnesian Wars is a scenario for Civilization IV: Warlords.
In this scenario, you can choose to play as either the Athenian civilization or the Spartan civilization. The Athenians are led by Pericles (Financial, Philosophical) and begin play with a strong navy and control of several islands, whereas the Spartans are led by King Archidamus II (Aggressive, Philosophical) and begin play with a strong land army and a consolidated empire. Each civilization controls different vassal states. The Persians are also present in this scenario, but they are not playable. There are new technologies in this scenario, as well as a new unit.
To achieve victory in this scenario, you must capture your opponent's capital city in 100 turns or less.