"After the defeat of much of the Corinthian fleet by Phormio in 429, the Peloponnesians had essentially given up the idea of defeating the Athenians at sea, much in the same way as the latter avoided pitched battle with Spartan hoplites. In response, the Athenians were often given a free hand to patrol the empire. They would do so with near impunity for almost the next sixteen years; the Peloponnesians, in contrast, resembled more the smaller German navy of the two world wars, venturing out to terrorize merchants and neutrals only when the British fleet was elsewhere or asleep.
Then, suddenly, the unexpected Athenian catastrophe of 413 in Sicily—216 imperial triremes (perhaps at least 160 of them Athenian) and almost 45,000 men of the empire were lost or captured—gave new impetus to Sparta's efforts to catch up and build a new Pan-Peloponnesian fleet fueled by Persian money. The vast armada of Athens had always been a fluke beyond what should have been the limited resources of any single city-state. Indeed, its creation in 482 was a result only of a rich strike in the silver mines of Laurium, and it was later sustained by the imperial tribute of hundreds of subject states. In contrast, without mines or tribute-paying subjects, Sparta's old pipe dream at the beginning of the war of creating a vast armada of 500 ships could be realized only by an unholy alliance with the empire of Persia.
It was not just that Athens had lost two-thirds of its once magnificent imperial fleet or that the roughly 100 reserve triremes that remained in the Piraeus were in various states of unreadiness. Instead, the greater dilemma was that the human losses at Sicily, coupled with the thousands of dead from the plague, had wiped out an entire generation of experienced Athenian rowers, teachers, and students of the sea, all almost impossible to replace at once. In a similar example, after the defeat of Lepanto (1571), the Ottoman catastrophe was not just the loss of almost 30,000 seamen and 200 galleys—or the thousands more sailors who were unaccounted for. Rather, the destruction of thousands of trained bowmen, archers who made Turkish ships deadly but took years to train properly, ensured that even after the hasty reconstruction of their fleet by the next year, the Ottomans would rarely again venture into Italian-controlled waters…"
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Armand