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The regimental War Diaries are held at The UK National Archives and as of April 2020 have been made available for free download*. They are the official unit war diaries for the British Army that contain records of daily activities, including casualties. They are not personal diaries.
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Private William Ernest Ellis
Royal Sussex Regiment
Date of death: 11/09/1914 (aged 19)
Cemetery: PRIEZ COMMUNAL CEMETERY
Son of John and Emily Frances Ellis, of Perrott's Cottage, Graffham, Petworth, Sussex. Born at Midhurst, Sussex.
Private William Charles Kelly
Date of death: 23/10/1916 (aged 25)
Cemetery: THIEPVAL MEMORIAL
Son of Harry and Ellen Kelly, of West Meon, Petersfield, Hants.