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78 legions served by thousands under King Darius. If, on the contrary, Alexander should defer his march against Babylon, and first seek an encounter with the Persian army, the country on each side of the Tigris in this latitude was highly advantageous for such an army as Darius commanded, and he had close in his rear the mountainous districts of Northern Media, where he himself had in early life been satrap, where he had acquired reputation as a soldier and a general, and where he justly expected to find loyalty to his person, and a safe refuge in case of defeat.

His great antagonist came on across the Euphrates against him, at the head of an army which Arrian, copying from the journals of Macedonian officers, states to have consisted of forty thousand foot and seven thousand horse. In studying the campaigns of Alexander, we possess the peculiar advantage of deriving our information from two of Alexander’s generals of division, who bore an important part in all his enterprises. Aristobulus and Ptolemy (who afterward became king of Egypt) kept regular journals of the military events which they witnessed, and these journals were in the possession of Arrian when he drew up his history of Alexander’s expedition. The high character of Arrian for integrity makes us confident that he used them fairly, and his comments on the occasional discrepancies between the two Macedonian narratives prove that he used them sensibly. He frequently quotes the very words of his authorities; and his history thus acquires a charm such as very few ancient or modern military narratives possess. The anecdotes and expressions which he records we fairly believe to be genuine, and not to be the coinage of a rhetorician, like those in Curtius. In fact, in reading Arrian, we read General Aristobulus and General Ptolemy on the campaigns of the Macedonians, and it is like reading General Jomini or General Foy on the campaigns of the French.

The estimate which we find in Arrian of the strength of