the openings are but little more than arrow-slits; on that within,
facing the town, are well-proportioned mullioned and transomed
windows. The great ribbed archway is grooved for a portcullis, now
removed, and a low doorway on either side gives entrance to the
chambers in the towers. Pottergate was rebuilt in the eighteenth
century and crowns a steep street; only four corner-stones marked T
indicate the site of Clayport. No trace of Narrowgate remains."[4]

As the destruction of many of our castles is due to the action of
Cromwell and the Parliament, who caused them to be "slighted" partly
out of revenge upon the loyal owners who had defended them, so several
of our town-walls were thrown down by order of Charles II at the
Restoration on account of the active assistance which the townspeople
had given to the rebels. The heads of rebels were often placed on
gateways. London Bridge, Lincoln, Newcastle, York, Berwick,
Canterbury, Temple Bar, and other gates have often been adorned with
these gruesome relics of barbarous punishments.

How were these strong walls ever taken in the days before gunpowder
was extensively used or cannon discharged their devastating shells?
Imagine you are present at a siege. You would see the attacking force
advancing a huge wooden tower, covered with hides and placed on
wheels, towards the walls. Inside this tower were ladders, and when
the "sow" had been pushed towards the wall the soldiers rushed up
these ladders and were able to fight on a level with the garrison.
Perhaps they were repulsed, and then a shed-like structure would be
advanced towards the wall, so as to enable the men to get close enough
to dig a hole beneath the walls in order to bring them down. The
besieged would not be inactive, but would cast heavy stones on the
roof of the shed. Molten lead and burning flax were favourite means of