Next year she was guilty of an act of sheer outrage. Her fleet descended on the island of Melos, which had remained neutral, though its inhabitants were colonists from the Spartan mainland close by. Nowhere does the dramatic nature of Thucydides' work stand more clearly revealed than in his account of this incident. He represents the Athenian and Melian leaders as arguing the merits of the case in a regular dialogue, essentially a dramatic device. The Athenian doctrine of Might and Expediency is unblushingly preached and acted upon, in spite of Melian protests; the island was captured, its population being slain or enslaved. Such an act is a fitting prelude to the great disaster which forms the next act of Thucydides' drama.
In 416 Athens proceeded to develop her design of subjugating Sicily. Segesta was at feud with Selinus; as the latter city applied to Syracuse for aid, the former bethought her of her ancient alliance with Athens. Next year the Sicilian ambassadors arrived with tales of unlimited wealth to finance an expedition. Nicias, the leader of the peace party, vainly counselled the Assembly to refrain; he was overborne by Alcibiades, whose ambition it was to reduce not only Sicily but Carthage also. When the expedition was about to sail most of the statues of Hermes in the city were desecrated in one night. Alcibiades, appointed to the command with Nicias and Lamachus, was suspected of the outrage, but was allowed to sail. The fleet left the city with all the pomp and ceremony of prayer and ritual, after which it showed its high spirits in racing as far as Aegina.
In Sicily itself Hermocrates, the great Syracusan patriot, repeatedly warned his countrymen of the coming storm, advising them to sink all feuds in resistance to the common enemy. He was opposed by Athenagoras, a democrat who, true to his principles, suspected the story as part of a militarist plot to overthrow the constitution. His speech is the most violent in Thucydides, but contains a passage of much value.
"The name of the whole is People, that of a part is Oligarchy;
the rich are the best guardians of wealth, the educated class can
make the wisest decisions, the majority are the best judges of
speeches. All these classes in a democracy have equal power both
individually and collectively. But oligarchy shares the dangers
with the many, while it does not merely usurp the material benefits,
rather it appropriates and keeps them all."
The Athenians received a cold welcome wherever they went. At Catana they found their state vessel waiting to convey Alcibiades home to stand his trial; he effected his escape on the homeward voyage, crossing to the Peloponnese. The great armament instead of thrusting at Syracuse wasted its time and efficiency on side-issues, mainly owing to the cold leadership of Nicias. This valuable respite was used to the full by Hermocrates, who at a congress held at Camarina was insistent on the racial character of the struggle between themselves who were Dorians and the Ionians from Athens. This national antipathy contributed greatly to the final decision of the conflict.
Passing to Sparta, Alcibiades deliberately betrayed his country. His speech is of the utmost importance.
His view of democracy is contemptuous. "Nothing new can be said of what is an admitted folly." He then outlined the Athenian ambition; it was to subdue Carthage and Sicily, bring over hosts of warlike barbarians, surround and reduce the Peloponnese and then rule the whole Greek-speaking world. He advised his hearers to aid Sicilian incapacity by sending a Spartan commander; above all, he counselled the occupation of Deceleia, a town in Attica just short of the border, through which the corn supply was conveyed to the capital; this would lead to the capture of the silver-mines at Laureium and to the decrease of the Athenian revenues. He concluded with an attempt to justify his own treachery, remarking that when a man was exiled, he must use all means to secure a return.
The Spartans had for some time been anxious to open hostilities; an act of Athenian aggression gave them an opportunity. Meanwhile in Sicily Lamachus had perished in attacking a Syracusan cross-wall. Left in sole command, Nicias remained inactive, while Gylippus, despatched from Sparta, arrived in Syracuse just in time to prevent it from capitulating. The seventh book is the record of continued Athenian disasters. Little by little Gylippus developed the Syracusan resources. First he made it impossible for the Athenians to circumvallate the city; then he captured the naval stores of the enemy, forcing them to encamp in unhealthy ground. Nicias had begged the home government to relieve him of command owing to illness. Believing in the lucky star of the man who had taken Nissea they retained him, sending out a second great fleet under Demosthenes. The latter at once saw the key to the whole situation. The Syracusan cross-wall which Nicias had failed to render impassable must be captured at all costs. A night attack nearly succeeded, but ended in total defeat. Demosthenes immediately advised retreat; but Nicias obstinately refused to leave. In the meantime the Syracusans closed the mouth of their harbour with a strong boom, penning up the Athenian fleet. The famous story of the attempt to destroy it calls out all the author's powers of description. He draws attention to the narrow space in which the action was fought. As long as the Athenians could operate in open water they were invincible; but the Syracusans not only forced them to fight in a confined harbour, they strengthened the prows of their vessels, enabling them to smash the thinner Athenian craft in a direct charge. The whole Athenian army went down to the edge of the water to watch the engagement which was to settle their fate. Their excitement was pitiable, for they swayed to and fro in mental agony, calling to their friends to break the boom and save them. After a brave struggle, the invaders were routed and driven to the land by the victorious Syracusans.
Retreat by land was the only escape. A strategem planned by Hermocrates and Nicias' superstitious terrors delayed the departure long enough to enable the Syracusans to secure the passes in the interior. When the army moved away the scene was one of shame and agony; the sick vainly pleaded with their comrades to save them; the whole force contrasted the proud hopes of their coming with their humiliating end and refused to be comforted by Nicias, whose courage shone brightest in this hour of defeat. Demosthenes' force was isolated and was quickly captured; Nicias' men with great difficulty reached the River Assinarus, parched with thirst. Forgetting all about their foes, they rushed to the water and fought among themselves for it though it ran red with their own blood. At last the army capitulated and was carried back to Syracuse. Thrown into the public quarries, the poor wretches remained there for ten weeks, scorched by day, frost-bitten by night. The survivors were sold into slavery.
"This was the greatest achievement in the war and, I think, in
Greek history the most creditable to the victors, the most
lamentable to the vanquished. In every way they were utterly
defeated; their sufferings were mighty; they were destroyed
hopelessly; ships, men, everything perished, few only returning
from the great host."