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.