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==Conclusion==

The Peloponnesian War was a terrible defeat for Athens. It was never again to be a great political force in the Greek world and beyond. The war had for many years gone well for the Athenians and by the time of the Peace of Nicias, it could even be said to have won a strategic victory. However, this was all to change after the Sicilian Expedition. It was a foolhardy and poorly planned invasion. It probably never had a chance of succeeding. The expedition was an unmitigated disaster for the Athenians and it weakened their army and navy. They were never as militarily powerful again. They did manage to continue the war but it was clear that they were always going to be on the defensive after Sicily. The expedition left the city militarily weakened it also weakened it financially. This led to heavy taxes that provoked a coup and government by an oligarchy. Athens was destabilized by the disaster in Sicily and this was a factor in its defeat. The Sicilian Expedition was the beginning of the end for Athens and her Empire and ensured that she would ultimately be defeated by her enemies.