suspended from a scaffold and moved by means of ropes; and lastly,
the movable ram, running on four or six wheels, which enabled it to be
advanced or withdrawn at will. The military engineers of the day allowed
full rein to their fancy in the many curious shapes they gave to this
latter engine; for example, they gave to the mass of bronze at its point
the form of the head of an animal, and the whole engine took at times
the form of a sow ready to root up with its snout the foundations of the
enemy's defences. The scaffolding of the machine was usually protected
by a carapace of green leather or some coarse woollen material stretched
over it, which broke the force of blows from projectiles: at times it
had an additional arrangement in the shape of a cupola or turret in
which archers were stationed to sweep the face of the wall opposite to
the point of attack.

[Illustration: 012.jpg THE MOVABLE SOW MAKING A BREACH IN THE WALL OF A
FORTRESS]

Drawn by Faucher-Gudin, from one of the bronze bas-reliefs
of the gate of Balawât.

The battering-rams were set up and placed in line at a short distance
from the ramparts of the besieged town; the ground in front of them was
then levelled and a regular causeway constructed, which was paved with
bricks wherever the soil appeared to be lacking in firmness. These
preliminaries accomplished, the engines were pushed forward by relays
of troops till they reached the required range. The effort needed to set
the ram in motion severely taxed the strength of those engaged in the
work; for the size of the beam was enormous, and its iron point, or the
square mass of metal at the end, was of no light weight. The besieged
did their best to cripple or, if possible, destroy the engine as it