What is a Norman Motte and Bailey?
This is a Motte and Bailey:
This is Norman advanced warfare, which gave them an advantage during their conquest of England. It's a quickly and easily erected small castle based upon a raised earthwork. Closer to it it's possible to see where the buildings stood. I'll try and get a photo for you.
This is the view from my apairy looking across towards the Motte and Bailey, it's covered in trees but is visible on the horizon in the middle of the photo. The farmer has planted barley in the field.