But
there was another use for these lofty towers. The fact is that the
Nuremberg engineers, at the time that they were built, had not yet
adopted a complete system of flank-works, and not having as yet applied
with all its consequences the axiom that that which defends should
itself be defended, they wanted to see and command their external
defenses from within the body of the place, as, a century before, the
baron could see from the top of his donjon whatever was going on round
the walls of his castle, and send up his support to any point of attack.
The great round towers of Nuremberg are more properly, in fact, detached
keeps than portions of a combined system, rather observatories than
effective defenses.
The round towers, however, were not the sole defenses of the gates.
Outside each one of them was a kind of fence of pointed beams after the
manner of a chevaux-de-frise, while outside the ditch and close to the
bridge stood a barrier, by the side of which was a guard-house. Tho it
was not till 1598 that all the main gates were fitted with drawbridges,
the wooden bridges that served before that could doubtless easily be
destroyed in cases of emergency. Double-folding doors and portcullises
protected the gateways themselves. Once past there, the enemy was far
from being in the town, for the road led through extensive advanced
works, presenting, as in the case of the Laufer Thor outwork, a regular
"place d'armes.
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