Defensive bank or wall surrounding a fortified site, such as a castle or settlement
This article's lead sectionmay be too short to adequately summarize the key points. Please consider expanding the lead to provide an accessible overview of all important aspects of the article.(April 2024)
^Friar, Stephen (2003). The Sutton Companion to Castles, Sutton Publishing, Stroud, 2003, p. 241. ISBN978-0-7509-3994-2
^Darvill, Timothy (2008). Oxford Concise Dictionary of Archaeology, 2nd ed., Oxford University Press, Oxford and New York, p. 376. ISBN978-0-19-953404-3.