Final answer:
The navy of Athens suffered a significant blow after the failed invasion of its Spartan ally, Syracuse, leading to further defeats and the collapse of the Athenian empire.
Explanation:
The navy of Athens was greatly weakened after a failed invasion of Syracuse, a Spartan ally. The disastrous Athenian expedition against Syracuse in 413 BCE led to the destruction of the entire Athenian force. This defeat significantly weakened Athens, paving the way for further Spartan victories and ultimately the fall of the Athenian empire.
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