(which, on this side, was not less than 60 feet deep), and through a
great gateway between two high square towers, which must have stood
where now there is a slope leading down from the level of the inner
court to that surrounded by a bank. This slope is probably formed by
the ruins of the gateway and tower having been pitched into the
ditch, as the readiest way of getting rid of them when the castle was
dismantled afterwards. We are indebted to the late Sir John Cowell
for the conjectural plan and description of the castle.

As soon as the Bishop had completed this much he would feel tolerably
safe, but he would not be satisfied. He could hardly have room in
his castle for all his retainers, and he could not command the
country from it, except towards the south; therefore his next work
was to make an embankment and the ditch on the outer side of it. It
was then an unbroken semicircle, jutting out as it were from the
castle, and protecting a sufficient space of ground for troops to
encamp.

In case of an enemy forcing their way into this, the defenders could
retreat into the castle by the drawbridge. The entrance was on the
east side, and in order to protect this and the back of the castle,
by which is meant the northern side, another embankment was made and
finished with a parapet. Also as, in case of this being carried by
the enemy, it would be impossible for the defenders in the northern
part of the castle to run round the castle and into shelter by the
main gateway, he built a square tower (exactly opposite to the ruin
which yet remains), and divided from it only by the great ditch. On
either side of the tower--cutting the embankment across, therefore,
at right angles--was a little ditch, spanned by a drawbridge, which,
if the defenders thought it necessary to retire to the tower, could