Among the Athenians at this time there was a general feeling of despondency and exhaustion. The full hardship of the war pressed heavily upon them, and their population was thinned by the ravages of the plague. In such a mood the thought of undertaking a campaign against a great island like Lesbos, then at the height of her power, filled them with dismay. Was it possible that a favoured and privileged ally had taken up arms against them in the hour of their distress? It was a slander, they could not, they would not believe it. At any rate, before proceeding to extremities, they would try the effect of a friendly remonstrance. So they sent envoys with a pacific message to the Mytilenaeans, hoping by fair words to deter them from their purpose. In this, however, they were disappointed, and being at last convinced that the Lesbians were on the brink of revolt, they sent off forty triremes without delay, in order, if possible, to catch them unawares. For they had been informed that the Mytilenaeans were about to celebrate the festival of Apollo, in which the whole population took part, outside the city walls; and if the triremes arrived in time, there would be a fine opportunity for a surprise. At the same time they took possession of ten Mytilenaean triremes, which had been sent to serve in the Athenian fleet, and imprisoned the crews.
But now was seen one of the weaknesses inherent in the nature of the Athenian constitution. These measures could not be taken without public debate in the popular assembly, and such a method of procedure rendered secrecy impossible. The Mytilenaeans received timely warning of their danger, and keeping close within their walls, repaired the weak places in their defences, and set a careful watch. Shortly afterwards the Athenian fleet hove in sight. As the Mytilenaeans refused to obey the summons delivered to them in the name of the imperial people,—that they should raze their walls, and surrender their ships,—hostilities commenced. But on neither side was much vigour displayed, for the Athenian officers thought themselves too weak to undertake any decisive operations with their present force, and the Mytilenaeans desired to obtain a respite, to enable them to obtain aid from Sparta. Accordingly they asked for an armistice, pretending that they wished to plead their cause by their own representatives before the Athenian assembly; and their request being granted, they sent envoys to Athens, who made a show of carrying on negotiations. And in the meantime a trireme was despatched in all haste to carry their petition to Sparta.
On the return of the Mytilenaean envoys from Athens, where of course they had accomplished nothing, the siege of Mytilene began in earnest. The city was situated on a promontory facing the Asiatic coast on the south-eastern side of the island, and had two harbours, on its northern and southern side. Both of these harbours were now held in close blockade by the Athenians, who established two camps, one on either side of the town, and patrolled the harbour-mouths with their ships. But on the land side the investment was not yet completed, so that supplies could still be brought into the town from the island. Reinforcements, however, came pouring into the Athenian quarters in answer to a summons sent to the cities of the Athenian alliance, who were the more willing to lend help, as the Lesbians made no vigorous effort in their own defence.
While the prospects of Athens were thus brightening, the Mytilenaean envoys, after a stormy voyage, arrived at Sparta, and laid their petition before the authorities. It happened that the Olympic festival was close at hand, where representatives would be present from all the cities of the Peloponnesian league; so the envoys received orders to go to Olympia, and state their case in the presence of the Spartan allies. They went, therefore, to Olympia, and when the festival was over, the Mytilenaean orator addressed the confederates as follows:—
"Before we urge our claim for assistance we wish to combat a prejudice which we know to be general in Greece against those who desert their allies in time of war. For we wish not only to obtain your countenance and support, but also to preserve your respect. To abandon an ally without just cause in a time of peril is justly regarded as an act of treason. But then the alliance must be a fair and equal relation voluntarily assumed on both sides, based on mutual esteem and parity of power. Can anyone assert that our connexion with Athens answers to this description? Have we not seen how the confederacy of maritime cities formed against Persia was gradually converted into an Athenian empire? And though we and the Chians enjoyed nominal independence, we had good reason to fear that this was only a temporary concession, which would be withdrawn as soon as the Athenians felt themselves strong enough to attack us. We were allowed to retain our liberty, partly because they feared our navy, and partly because they wished to make us accomplices in their own aggressions, and lend an appearance of equity to the acts of violence in which we were compelled to take part. Having swallowed up the smaller states, they were ready to pounce upon us, and were only prevented by the outbreak of the present war. Who, then, can blame us, if we seized the opportunity when they were weakened to repudiate this false alliance, and anticipate the blow which they were preparing for us? Athens, we repeat, has no just title to our allegiance; the bond which held us together was fear on our side and interest on theirs. We are natural enemies; and when your foe is disabled, then is the time to strike.
"Having thus cleared ourselves from the imputation of disloyalty, we will now make plain to you the advantages which you will gain by espousing our cause. If you wish to inflict irreparable injury on Athens, you must promote every hostile movement against her in those regions which contain the sources of her power, that is to say, the islands and coast-lands of the Aegaean. For if our revolt is successful, others will follow our example, and the Athenians will be stripped of their revenues, the mainstay of their empire. You can lend us aid most effectually by summoning your allies for a second [Footnote: Attica had already been invaded earlier in the summer.] invasion of Attica, and thus preventing the Athenians from sending reinforcements to Lesbos. You have a rare opportunity, for their city is wasted by the plague, and their navies are dispersed on foreign service. Remember, then, your proud position as champions of Greek liberty, and put away the reproach which you have sometimes incurred by leaving the revolted subjects of Athens to fight their battles alone. [Footnote: As in the case of Samos.] For the cause of Lesbos is the cause of all Greece."
It will be observed that the greater part of this remarkable speech consists of an elaborate endeavour on the part of the Mytilenaeans to justify themselves. The arguments employed were entirely sophistical, for the Lesbians had no real grievance—and the statement that they were in danger of losing their independence was a pure invention. But they spoke to a partial audience, and the Spartans had already prejudged the case in their favour. It was therefore decided to receive them into the Peloponnesian alliance, and orders were issued to the allies to assemble at the Isthmus with two-thirds of their forces for an immediate invasion of Attica. The Spartans, acting with unusual vigour, were the first to appear at the Isthmus, where they made preparations for hauling ships overland from the northern harbour of Corinth, intending to attack Athens by sea and land. But the rest of the confederates came in but slowly, as they were engaged in getting in their harvest, and had little inclination for a second campaign.
The Spartans soon found out that they were mistaken in supposing the energies of Athens to be exhausted. Without moving their fleet from Lesbos, the Athenians manned a hundred triremes, raising the crews from the whole body of the citizens, with the exception of the knights and the wealthiest class of the Solonian census, and pressing even resident foreigners into the service; and with this imposing force they made an armed demonstration before the eyes of their enemies at the Isthmus, and then, coasting along Peloponnesus, made descents wherever they pleased. This spirited conduct produced the desired effect. For the Spartans, who were still waiting for their allies at the Isthmus, saw themselves baffled in all their calculations, and concluded that they had been misinformed by the Lesbians as to the state of affairs at Athens; and hearing that their own coast-lands were being ravaged by the Athenian fleet, they hastily decamped, and the plan of a second invasion came to nothing.
The summer was now drawing to a close, and as yet no progress had been made with the siege of Mytilene. The town was still blockaded by sea, but the Mytilenaeans had free egress on the land-side, and marched up and down the island, confirming the other towns which had joined in the revolt, and threatening Methymna, which still remained loyal to the Athenian alliance. When the Athenians were informed of this state of things, they sent a thousand hoplites under Paches to reinforce the besieging army; and on their arrival the investment of Mytilene was completed by a wall drawn from sea to sea, and cutting off the town from the rest of the island. The Mytilenaeans now began to despair, for their supplies were failing, and there seemed no hope of relief. But during the winter a ray of hope reached them from outside, and encouraged them to persevere in their resistance. There was a weak point in the Athenian wall, where it closed a ravine; and through this interval a Spartan named Salaethus, who had sailed to Lesbos in a trireme, and crossed the island on foot, succeeded in making his way into the town. Salaethus announced himself as an agent sent from Sparta, to inform the distressed garrison that, as soon as the season permitted, forty triremes would be sent to their assistance, and that Attica would be invaded at the same time, to keep the enemy occupied at home. At this welcome news the hopes of the Mytilenaeans revived, and all thoughts of surrender were laid aside.
II