dern soldier, they were trained by a regular step to advance, in about
six hours, near twenty miles. [63] On the appearance of an enemy, they
threw aside their baggage, and by easy and rapid evolutions converted
the column of march into an order of battle. [64] The slingers and
archers skirmished in the front; the auxiliaries formed the first line,
and were seconded or sustained by the strength of the legions; the
cavalry covered the flanks, and the military engines were placed in the
rear.

[Footnote 62: Cicero in Tusculan. ii. 37, [15.]--Joseph. de Bell. Jud.
l. iii. 5, Frontinus, iv. 1.]

[Footnote 63: Vegetius, i. 9. See Memoires de l'Academie des
Inscriptions, tom. xxv. p. 187.]

[Footnote 64: See those evolutions admirably well explained by M.
Guichard Nouveaux Memoires, tom. i. p. 141--234.]

Such were the arts of war, by which the Roman emperors defended their
extensive conquests, and preserved a military spirit, at a time when
every other virtue was oppressed by luxury and despotism. If, in the
consideration of their armies, we pass from their discipline to their
numbers, we shall not find it easy to define them with any tolerable
accuracy. We may compute, however, that the legion, which was itself a
body of six thousand eight hundred and thirty-one Romans, might, with
its attendant auxiliaries, amount to about twelve thousand five hundred
men. The peace establishment of Hadrian and his successors was composed
of no less than thirty of these formidable brigades; and most probably
formed a standing force of three hundred and seventy-five thousand men.
Instead of being confined within the walls of fortified cities, which
the Romans considered as the refuge of weakness or pusillanimity, the
legions were encamped on the banks of the great rivers, and along the
frontiers of the barbarians. As their stations, for the most
part, remained fixed and permanent, we may venture to describe the
distribution of the troops. Three legions were sufficient for Britain.
The principal strength lay upon the Rhine and Danube, and consisted of
sixteen legions, in the following proportions: two in the Lower, and
three in the Upper Germany; one in Rhaetia, one in Noricum, four
in Pannonia, three in Maesia, and two in Dacia. The defence of the
Euphrates was intrusted to eight legions, six of whom were planted in
Syria, and the other two in Cappadocia. With regard to Egypt, Africa,
and Spain, as they were far removed from any importa