What was the decisive outcome of the Battle of Aegospotami?

The decisive outcome of the Battle of Aegospotami was a Spartan victory over Athens. This battle, fought in 405 BC, effectively marked the end of major naval operations during the Peloponnesian War. The defeat of the Athenian fleet by the Spartans, commanded by Lysander, led to the destruction of a large portion of Athenian naval power. This loss severely weakened Athens and set the stage for the eventual fall of the city itself in 404 BC.

Although the Athenian navy was indeed destroyed and the battle significantly contributed to the conclusion of the Peloponnesian War, it was primarily the Spartan victory that turned the tide decisively against Athens, confirming Sparta's dominance in the conflict. Thus, the most comprehensive understanding of the outcome reflects the Spartan advantage that ultimately led to the war's conclusion. The formation of the Athenian League is not a result of this outcome, as it predates the battle and does not relate to the events that unfolded there.