As well as the Brighton Dome being used as a hospital during WW1 alot of local village halls in the county were also used for the same purpose. I know the King Edward Hall in Lindfield was used as one.
Let's not forget 'The Day Sussex Died'. June 30th 1916 at the battle of Boar's Head. A diversionary attack for the Somme the following day. A causaulty list of nearly 1,100 men of the Royal Sussex. Of which 17 officers and 364 other ranks were killed. Included in that list were 12 sets of brothers.