In the present instance the northern side, the
longest, extending nearly five thousand feet, fronts the channel, and it
required no other defence than was afforded by the perpendicular face of
the cliff, here more than two hundred feet in height. The western side,
the second in length, and not greatly inferior to the first, after
running about three thousand feet from the sea, in a tolerably straight
line southward, suddenly bends to the east, and forms two semi-circles,
of one of which the radius is turned from the camp, and of the other
into it. The third side is scarcely more than half the length of the
others, and runs nearly straight from south to north, where it again
unites with the cliff. Of the two last-mentioned sides the first is
difficult of access; from its position at the summit of a steep hill;
but it is still protected by a vallum from thirty to forty feet high,
and between the sea and the entrance nearest to it, a length of about
three hundred yards, by a wide exterior ditch with other out-works, as
well as by an inner fosse, faint traces of which only now remain.
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