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opportune moments as well as all those things which, in part, shall
be briefly noted below.
1) I have a sort of extremely light and strong bridges, adapted to
be most easily carried, and with them you may pursue, and at any
time flee from the enemy; and others, secure and indestructible by
fire and battle, easy and convenient to lift and place. Also methods
of burning and destroying those of the enemy.
2) I know how, when a place is besieged, to take the water out of
the trenches, and make endless variety of bridges, and covered ways
and ladders, and other machines pertaining to such expeditions.
3) Item. If, by reason of the height of the banks, or the strength
of the place and its position, it is impossible, when besieging a
place, to avail oneself of the plan of bombardment, I have methods
for destroying every rock or other fortress, even if it were founded
on a rock, &c.
4) Again I have kinds of mortars; most convenient and easy to carry;
and with these can fling small stones almost resembling a storm; and
with the smoke of these causing great terror to the enemy, to his
great detriment and confusion.
9
) [8] And when the fight should be at sea I have kinds of many
machines most efficient for offence and defence; and vessels which
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