the generally-received accounts of the stupendous dimensions of the
works, and of new systems of fortifications brought into play. The
plain truth is, that these defences were simple temporary fortifications
of rather greater dimensions than usual, and that not a single new
principle of engineering was developed. It is true, that there were
several novel minor details, such as the rope mantelets, the use of
iron tanks, etc., but the whole merit consisted in the admirable
adaptation of well-known principles to the peculiar locality and
circumstances of the case. Neither can it be asserted that the plans
of the various works were perfect. On the contrary, there is no