Any earthworks, walling, bastion or fortified outwork, or combination of these, generally with ditch or moat.
![Horsford Castle from the air showing the bailey and the motte around the keep. There may have been a fortified barbican between the bailey and motte.](http://hbsmrgateway2.esdm.co.uk/norfolk/DataFiles/FullImages/1044.jpg)
Horsford Castle from the air showing the bailey and the motte around the keep. There may have been a fortified barbican between the bailey and motte. (© NCC)