So humiliating a defeat had to be avenged, and Sparta organized a new expedition. This time a fleet of 77 triremes was collected. Meanwhile Phormio had sent to Athens the news of his victory together with an urgent plea for reënforcements. Unfortunately the great Pericles was dying and the government had fallen into weak and unscrupulous hands. Consequently while 20 triremes were ordered to the support of Phormio, political intrigue succeeded in diverting this squadron to carry out a futile expedition to Crete, and Phormio was left to contest the control of the gulf against a fleet of 77 with nothing more than his original twenty.

It is interesting to observe what strategy Phormio adopted in this difficult situation. In the campaign of Salamis, Themistocles chose the narrow waters of the strait as the safest position for a fleet outnumbered by the enemy, because of the protection offered to the flanks by the opposite shores. But Phormio, commanding a fleet about one-fourth that of his adversary, chose the open sea. Apparently his decision was based on the fact that the superiority of the Athenian ship lay in its greater speed and skill in maneuvering. Unable to cope with his adversary in full force, he might by his superior mobility beat him in detail. Accordingly, he boldly took the open sea.

For about a week the two fleets lay within sight of each other, with Phormio trying to draw his enemy out of the narrows into open water and his adversary attempting to crowd him into a corner against the share. Finally the Peloponnesian, realizing that Phormio would have to defend his base, and hoping to force him to fight at a disadvantage, moved upon Naupaktis. As this port was undefended, Phormio was compelled to return thither.

The Peloponnesian fleet advanced in line of four abreast with the Spartan admiral and the twenty Spartan triremes—the best in the fleet—in the lead. At the signal from the admiral the column swung "left into line" and bore down in line abreast upon the Athenians who were ranging along the shore in line ahead. The object of the maneuver was to cut the Athenians off from the port and crowd them upon the shore. The latter, however, developed such a burst of speed that eleven of the twenty succeeded in reaching Naupaktis; the remaining nine drove ashore and their crews escaped. Apparently the victory of the Spartan was as complete as it was easy. But while the rest of the fleet busied itself with the deserted Athenian triremes on the share, the Spartan squadron continued in the pursuit of the eleven Athenian ships that were heading for Naupaktis. Ten of the eleven reached port and drew up in a position of defense. The eleventh, less speedy than the rest, was being overhauled by the Spartan flagship which was pushing the pursuit far in advance of the rest of the squadron. The captain of the Athenian ship, seeing this situation, determined on a bold stroke. Instead of pushing on into the harbor he pulled round a merchant ship that lay anchored at the mouth, and rammed his pursuer amidships, disabling her at a blow. The Spartan admiral promptly killed himself and the rest of the ship's company were too panic stricken to resist.

At this disaster the rest of the Spartan squadron hesitated, dropped oars or ran into shallow water. Seeing his opportunity, Phormio dashed out of the harbor with his ten triremes and fell upon the Spartans. In spite of the ridiculous disparity of forces, this handful of Athenian ships pressed their attack so gallantly that they destroyed the Spartan advance wing and then, catching the rest of the fleet in disorder, routed the main body as well. By nightfall Phormio had rescued eight of the nine Athenian triremes that had fallen into the hands of the enemy and sent the scattered remnants of the Peloponnesian fleet in full flight towards Corinth. This battle of Naupaktis remains one of the most brilliant naval victories in history, a victory won against overwhelming odds by quick decision and superb audacity.

Only a half century separates Salamis from the battle of the Corinthian Gulf and the battle of Naupaktis, but during that period there had been a great advance in naval science.

As far as naval tactics are concerned, Salamis was merely a fight between two mobs of ships, except that when opportunity offered, a vessel used her ram. Otherwise the only difference from land fighting was the fact that the combatants stood on floating platforms. But in the Peloponnesian war we see not only the birth of naval tactics but a very high development, especially as revealed in these two victories of Phormio.

With the development of a naval science rose also a naval profession. At Salamis Themistocles was a politician and Eurybiades was a soldier; it happened that they were made fleet commanders for the emergency. Phormio was a naval officer by profession, and he won by genius combined with superior efficiency in the personnel under his command. In his courage, resourcefulness, in the spirit he inspired, and the high pitch of skill he developed among his officers and men, he is an ideal type for every later age. Little is known of his life and character beyond the story of these two exploits, but they are sufficient to give him the name of the first great admiral of history.

His exploits illustrate, too, at the very outset of naval history, the vital truth that the man counts more than the machine. In these later days, when the tendency is to measure naval power merely by counting dreadnoughts, and to settle all hypothetical combats by the proportion of strength at a given point on the game board, it is well to remember that the most overwhelming victories have been won by the skill and audacity of a great leader, which overcame odds that would be reckoned by the experts as insuperable.

The Peloponnesian war dragged on with varying fortunes for ten years. The Athenians were regularly successful on the sea and unsuccessful on land. They seem to have laid an unwise dependence on their navy for a state situated on the mainland with land communications open to the enemy. They attempted to make an island of their state by withdrawing into the city of Athens the entire population of Attica, leaving open to the invader the rest of the province. The repeated ravaging of Attica by Peloponnesian armies weakened both the resources and the morale of the Athenians, and the crowding of the inhabitants into the city resulted in frightful mortality from the plague. At the same time the naval expeditions sent out to harry the coast of the Peloponnesus accomplished nothing of real advantage.