Think the Battle of Salamis...the oracle predicted that Greece's only salvation from the Persians was through 'wooden walls' which turned out to be triremes, large ships built like the ships the Persians had. Navel strength was important to the Greeks at this point as the Persians were much more numerous and stronger on land, with exception to possibly the Spartans. Without triremes, the Greeks would have lost the naval wars and would probably not have gained the position of power from Persia. It's pretty sketchy but just look up the Salamis battle for proper info