Originally published in 1896 as part of the Pitt Press Series, this book contains the Greek text of the fourth book of Thucydides' history of the Peloponnesian War, which includes rising political difficulties in Sicily and the various successes of Brasidas in Thrace. The text is prefaced by an introduction on the origins of the war, and there is a thorough commentary on grammatical, stylistic and historical aspects at the end of the volume. This book will be of value to anyone with an interest in Greek history or in the development of the writing of history.