Seen in use mostly in 12th to 15th Germany, The Neck Ditch involved construction of a dry ditch that only encompasses two sides of a Castle or similar defensive structure. They would only be constructed if there were no natural protective barriers (rocks, trees, etc). Often dug deep and at odd angles (to hinder advance of enemy troops and use of siege equipment). Neck Ditches were often used with The Spur Castle design. Drawbridges and related crossing techniques were used in conjunction.