You can still see where the Roundhead artillery hit Richard III’s Octagonal Tower, also known as the Well Tower, at Sandal Castle. I’ve also drawn one of the forty cannon balls that were found on this slope during the excavations. The tower was already in a poor state of repair before the siege of 1645 but the bombardment reduced much of the keep to rubble.
The rectangular structure immediately to the left of the impact was a garderobe chute.