Donald Kagan 
Peace of Nicias and the Sicilian Expedition [PDF ebook] 

"This is a solid piece of scholarship, a readable, consistent, and understandable account of a difficult period in Greek history, and rife with astute and provocative observations on Thucydides."- The Historian Why did the Peace of Nicias fail to reconcile Athens and Sparta? Donald Kagan examines the years between the signing of the peace treaty and the destruction of the Athenian expedition to Sicily in 413 B.C. The principal figure in the narrative is the Athenian politician and general Nicias, whose policies shaped the treaty and whose military strategies played a major role in the attack against Sicily.