Mezue ahịrịokwu na-esonụ: First nyere earthworks na 1779 megide
N'afọ ahụ, e mere atụmatụ ịwakpo Dover, England, ebe dị elu nke dị n'ebe ọdịda anyanwụ, nke a na-akpọ Dover Western Heights ugbu a, ka e wusiri ike na 1804 mgbe Lieutenant-Colonel William Twiss nyere ntụziaka imeziwanye nchebe ndị dị ugbu a. Nke a bụ akụkụ nke nnukwu mmemme nke mgbidi iji meghachi omume na mwakpo nke Napoleon na United Kingdom. Ọ na-esote ogologo oge nke ọrụ metụtara ya site na Twiss na ịkwalite mgbidi nke Dover Castle dị nso (1794<unk>1803).