To say that this work covers the period of the Peloponnesian War as no modern period of history has been covered; to say that no modern historian has dealt with his topic with the calm impartiality of Thucydides; to say that no writer can hope to produce an historical narrative comparable to the seventh book, or to any other book, of Thucydides—to say such things as these is to abandon the broad impartial view from which alone criticism worthy of the name is possible, and to come under the spell of other minds.
But all this must not be taken as in any sense denying that the work of Thucydides is a marvellous production. Considering the time when it was written, and that its author was a participant in many of the events which he describes, it is astonishing that his work should be measurably free from partiality. That it is so was, perhaps, at least in some measure, due to the fact that Thucydides was banished from Athens, and hence wrote his history not so much from the Athenian standpoint, as from the standpoint of a man without a country, who was at enmity with both Spartans and Athenians. But, partial or impartial, the history of Thucydides remains, and presumably must always remain, the sole contemporary record open to posterity of that great struggle through which Greece, as it were, voluntarily threw away her prestige and her power.
Thucydides, to be sure, did not complete his history of the war, or, if he did, his later chapters have not been preserved to us. The former supposition is doubtless the correct one, because the thread of the narrative, which Thucydides dropped so abruptly, was taken up by Xenophon, also a contemporary. It was a not unusual custom among the ancient authors to write important works as explicit continuations of the works of other writers. Xenophon’s narrative of the events of the later years of the Peloponnesian War is such a work. Like the history of Thucydides it is practically our sole authority for the period that it covers, but, by common consent of critics, it takes a much lower level than the work which it supplements.
Xenophon was also an exile from Athens; but he differed from Thucydides in being an ardent friend of Sparta, and his prejudices are well known to readers of his works. One must suppose, however, that the favourite pupil of Socrates may be depended upon for reasonable impartiality when he deals with matters of fact. But, be this as it may, it is Xenophon, and Xenophon alone, who tells us most that we know at first hand, not alone of the closing years of the Peloponnesian War, but of many in the period succeeding. We shall constantly support our narrative of the events of this period, therefore, by references to the pages of Xenophon, as well as to those of Thucydides.
THE ORIGIN OF THE WAR