Kammala wannan jumla: Na farko da aka ba da aikin ƙasa a 1779 a kan
An shirya mamayewa a wannan shekarar, an yi amfani da tudun da ke yammacin Dover, Ingila, yanzu ana kiransa Dover Western Heights, a cikin 1804 lokacin da aka umurci Lieutenant-Colonel William Twiss don sabunta tsaro na yanzu. Wannan wani ɓangare ne na babban shirin ƙarfafawa don mayar da martani ga shirin Napoleon na mamaye Ingila. Ya biyo bayan wani lokaci mai tsawo na aikin da aka danganta da Twiss a kan ingantawa na garkuwar Dover Castle (1794 <unk> 1803).