Fortifications in England

defensive earthworks on the border between Anglian (or 'English') Mercia and the Kingdom of Wales

thumb|350px|A map of burhs named in the 10th-century Burghal Hidage. A burh () or burg was an Anglo-Saxon fortification or fortified settlement. In the 9th century, raids and invasions by Vikings prompted Alfred the Great to develop a network of burhs and roads to use against such attackers. Some were new constructions; others were situated at the site of Iron Age hillforts or Roman forts and employed materials from the original fortifications. As at Lundenburh (medieval London), many were also situated on rivers: this facilitated internal lines of supply while aiming to restrict access to the

linear earthwork in Wales and England

ancient linear earthwork in Cambridgeshire

Grade I listed gatehouse in Canterbury, Kent, England, UK