backed by the hills that are covered by the forest of the same name.
Either this forest, or the neighboring one of Eavy, is supposed to have
been the ancient Arelanum. The little river called the Arques flows
through the valley, and beneath the walls of the castle is lost in the
Béthune, under which name the united waters continue their course to
Dieppe, after receiving the tribute of a third, yet smaller, stream, the
Eaulne.

Of the power of the castle an idea may be formed from the extent of the
fosse, little less than half a mile in circumference. The outline of the
walls is irregularly oval, and the even front is interrupted by towers
of various sizes, and placed at unequal distances. On the northern side,
where the hill is steepest, there are no towers; but the walls are still
farther strengthened by square buttresses, so large that they indeed
look like bastions, and with a projection so great as to indicate an
origin posterior to the Norman æra. The two towers which flank the
western entrance, and the towers which stand behind each of the flanking
towers in the retiring line of the wall, are much larger than any of the
rest. One of the latter towers is of so extraordinary a shape, that I
consider it as a non-descript; but, as I should tire both you and myself
by endeavoring to describe it, I think it most prudent to refer you to a
sketch: perhaps its angular parts may not be coeval with the rest of the
building[21]: on this it would be impossible to decide positively, so
shattered, impaired, and defaced are the walls, and so evidently is
their coating the work of different periods. I fancied that in some
parts I could discern a mode of construction, in layers of brick and
stone, similar to that of Roman buildings in our own country, while
many of the bricks, from their texture and shape, appear also to be
Roman. Tradition, if we follow that delusive guide, teaches us that we
are contemplating a work of the middle of the eighth century, and of one