As Gatehouse has developed over the years several pages of various data and opinion of interest to castle studies have been added. Feedback suggests the most important of these is a list of licences to crenellate. However there are other pages of interest and it is the intent to continue to add items.
There are also a few essays on various aspects of castle studies. The author is not someone who feels a need to reinvent the wheel and these essays are either about subjects rarely covered or have a different perspective from the usual writings.