d by Justinian to the danger of their situation. A ditch
and palisade might be sufficient to resist the artless force of the
cavalry of Scythia; but more elaborate works were required to sustain
a regular siege against the arms and treasures of the great king. His
skilful engineers understood the methods of conducting deep mines, and
of raising platforms to the level of the rampart: he shook the strongest
battlements with his military engines, and sometimes advanced to the
assault with a line of movable turrets on the backs of elephants. In
the great cities of the East, the disadvantage of space, perhaps of
position, was compensated by the zeal of the people, who seconded the
garrison in the defence of their country and religion; and the fabulous
promise of the Son of God, that Edessa should never be taken, filled the
citizens with valiant confidence, and chilled the besiegers with doubt
and dismay. The subordinate towns of Armenia and Mesopotamia were
diligently strengthened, and the posts which appeared to have
any command of ground or water were occupied by numerous forts,
substantially built of stone, or more hastily erected with the obvious
materials of earth and brick. The eye of Justinian investigated every
spot; and his cruel precautions might attract the war into some lonely
vale, whose peaceful natives, connected by trade and marriage, were
ignorant of national discord and the quarrels of princes. Westward of
the Euphrates, a sandy desert extends above six hundred miles to the Red
Sea. Nature had interposed a vacant solitude between the ambition of two
rival empires; the Arabians, till Mahomet arose, were formidable only as
robbers; and in the proud security of peace the fortifications of Syria
were neglected on the most vulnerable side.

But the national enmity, at least the effects of that enmity, had
been suspended by a truce, which continued above fourscore years. An
ambassador from the emperor Zeno accompanied the rash and unfortunate
Perozes, in his expedition against the Nepthalites, or white Huns,
whose conquests had been stretched from the Caspian to the heart of
India, whose throne was enriched with emeralds, and whose cavalry was
supported by a line of two thousand elephants. The Persians were
twice circumvented, in a situation which made valor useless and flight
impossible; and the double victory of the Huns was achieved by military
stratagem. They dismissed their royal captive after he had submitte