▁replace ▁the ▁ 1 7 9 5 ▁emp lac ements , ▁which ▁had ▁suffered ▁from ▁the ▁salt ▁air ▁and ▁decay ed , ▁but ▁the ▁plan ▁was ▁turned ▁down ▁in ▁order ▁to ▁focus ▁attention ▁on ▁the ▁re development ▁of ▁the ▁keep . ▁The ▁work ▁was ▁carried ▁out ▁by ▁a ▁mixture ▁of ▁soldiers ▁and ▁civil ian ▁contract ors ▁and ▁was ▁completed ▁by ▁the ▁end ▁of ▁ 1 8 0 6 . ▁ ▁The ▁rem od elled ▁castle ▁did ▁not ▁play ▁an ▁active ▁part ▁in ▁the ▁Napole onic ▁Wars , ▁although ▁it ▁was ▁used ▁in ▁ 1 8 0 9 ▁as ▁a ▁hospital ▁for ▁injured ▁soldiers ▁returning ▁from ▁the ▁Pen ins ula ▁Camp aign ▁in ▁Spain . ▁A ▁second ▁l ighth ouse , ▁known ▁as ▁the ▁High ▁L ighth ouse , ▁was ▁constructed ▁alongside ▁the ▁castle ▁in ▁ 1 8 1 2 . ▁ ▁Official ▁interest ▁in ▁Hur st ▁Castle ▁increased ▁again ▁in ▁the ▁ 1 8 4 0 s , ▁as ▁the ▁introduction ▁of ▁shell ▁guns ▁and ▁steam ▁ships ▁created ▁a ▁new ▁risk ▁that ▁the ▁French ▁might ▁successfully ▁attack ▁along ▁the ▁south ▁coast . ▁Pre viously , ▁sail ing ▁ships ▁had ▁been ▁only ▁able ▁to ▁pass ▁the ▁castle ▁slowly ▁when ▁moving ▁against ▁the ▁t ide , ▁making ▁them ▁vulner able ▁to ▁its ▁guns ; ▁steam ▁ships ▁threatened ▁to ▁cru ise ▁past ▁at ▁speed . ▁Military ▁estimates ▁and ▁surve ys ▁in ▁ 1 8 5 0 ▁and ▁ 1 8 5 1 ▁suggested ▁that ▁the ▁arm ament ▁should ▁therefore ▁be ▁significantly ▁increased , ▁to ▁include ▁more