Thucydides 
The History of the Peloponnesian War [EPUB ebook] 

Written four hundred years before the birth of Christ, this detailed contemporary account of the long life-and-death struggle between Athens and Sparta stands an excellent chance of fulfilling its author’s ambitious claim. Thucydides himself (c.460-400 BC) was an Athenian and achieved the rank of general in the earlier stages of the war. He applied thereafter a passion for accuracy and a contempt for myth and romance in compiling this factual record of a disastrous conflict.