ed for his baggage, and
eighty or ninety for the service of war. The Greeks have varied with
regard to the number which Porus brought into the field; but Quintus
Curtius, (viii. 13,) in this instance judicious and moderate, is
contented with eighty-five elephants, distinguished by their size and
strength. In Siam, where these animals are the most numerous and the
most esteemed, eighteen elephants are allowed as a sufficient proportion
for each of the nine brigades into which a just army is divided. The
whole number, of one hundred and sixty-two elephants of war, may
sometimes be doubled. Hist. des Voyages, tom. ix. p. 260. * Note:
Compare Gibbon's note 10 to ch. lvii--M.]

[Footnote 50: Hist. August. p. 133. * Note: See M. Guizot's note, p.
267. According to the Persian authorities Ardeschir extended his
conquests to the Euphrates. Malcolm i. 71.--M.]

Our suspicious are confirmed by the authority of a contemporary
historian, who mentions the virtues of Alexander with respect, and
his faults with candor. He describes the judicious plan which had been
formed for the conduct of the war. Three Roman armies were destined
to invade Persia at the same time, and by different roads. But the
operations of the campaign, though wisely concerted, were not executed
either with ability or success. The first of these armies, as soon as it
had entered the marshy plains of Babylon, towards the artificial conflux
of the Euphrates and the Tigris, [51] was encompassed by the superior
numbers, and destroyed by the arrows of the enemy. The alliance of
Chosroes, king of Armenia, [52] and the long tract of mountainous
country, in which the Persian cavalry was of little service, opened
a secure entrance into the heart of Media, to the second of the Roman
armies. These brave troops laid waste the adjacent provinces, and by
several successful actions against Artaxerxes, gave a faint color to the
emperor's vanity. But the retreat of this victorious army was imprudent,
or at least unfortunate. In repassing the mountains, great numbers of
soldiers perished by the badness of the roads, and the severity of
the winter season. It had been resolved, that whilst these two great
detachments penetrated into the opposite extremes of the Persian
dominions, the main body, under the command of Alexander himself, should
support their attack, by invading the centre of the kingdom. But the
unexperienced youth, influenced by his mother's counsels, and perhaps by