History of the Peloponnesian War

It happened too, immediately after the battle of Amphipolis and the retreat of Ramphias from Thessaly, that neither party any longer applied themselves at all to the war, but they were rather inclined for peace. The Athenians were so, as having received a severe blow at Delium, and again shortly after at Amphipolis; and as no longer having that confident hope in their strength, through which they would not before accept the offered treaty, thinking, in consequence of their present success, that they should come off victorious in the struggle.

Besides, they were also afraid of their allies, lest they should be encouraged by their reverses to revolt on a larger scale; and they repented not having come to an arrangement, when they had a fine opportunity, after the events at Pylus.