History of the Peloponnesian War

Now the Lacedaemonians (for it fell to their lot to be the first to restore what they held) immediately released the men who were prisoners in their country; and sending as ambassadors to the countries Thrace-ward, Ischagoras, Menas, and Philocharidas, commanded Clearidas to restore Amphipolis to the Athenians, and the rest of the states to accept the treaty, as it had been severally arranged for them.

They, however, would not, as they thought it not favourable to them; nor did Clearidas restore the city, wishing to oblige the Chalcidians, and declaring that he could not give it up in opposition to them.