The pillboxes, located at distances of 894m to the north-northeast, 320m to the northwest, 301m to the south, and 718m to the southwest of Mitford Bridge, are well-preserved standing structures and exemplify elements of a Stop Line. These lines were field fortifications established during World War II to defend against invasion, strategically positioned to gradually impede enemy advances. The four pillboxes were part of the Northern Command River Wansbeck Stop Line, showcasing a significant example of homeland defense during the war. Their proximity to Mitford Castle enhances their historical importance by illustrating the evolution of fortification and defense strategies from medieval times to the 20th century.