History of the Peloponnesian War

When he had thus arranged every thing in the assembly, and the Athenians had voted him the command of the expedition, having associated with himself one of the generals at Pylus, namely, Demosthenes, he prepared to set sail as quickly as possible.

He chose Demosthenes for his colleague, because he heard that he was himself meditating a descent on the island. For the soldiers, being distressed by their want of room, and being a besieged rather than a besieging party, were eager to run all risks. The firing of the island had moreover given him confidence.