Alcibiades (23.1-23.2)

When these great judgments and condemnations were passed upon Alcibiades, he was tarrying in Argos, for as soon as he had made his escape from Thurii, he passed over into Peloponnesus. But fearing his foes there, and renouncing his country altogether, he sent to the Spartans, demanding immunity and confidence, and promising to render them aid and service greater than all the harm he had previously done them as an enemy.

The Spartans granted this request and received him among them. No sooner was he come than he zealously brought one thing to pass: they had been delaying and postponing assistance to Syracuse; he roused and incited them to send Gylippus thither for a commander, and to crush the force which Athens had there. A second thing he did was to get them to stir up the war against Athens at home; and the third, and most important of all, to induce them to fortify Deceleia.[*] This more than anything else wrought ruin and destruction to his native city.