Slighting is the deliberate destruction, partial or complete, of a fortification without opposition, to render it unusable as a fortress.{sfn|Hull|2008|p=86}{Better source|date=July 2014} Sometimes, such as during the Wars of Scottish Independence and the English Civil War slighting are carried out on a systematic basis as part of a policy by one ... Found on http://en.wikipedia.org/wiki/Slighting
the process of rendering a castle useless to prevent its future use. Dismantling a fortification. This was done by breaching walls, undermining walls, and later, by blowing them up with gun powder Found on http://www.castles-of-britain.com/glossary.htm