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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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Gunner James Frank Styles
Royal Field Artillery
Date of death: 16/09/1916 (aged 22)
Cemetery: BRONFAY FARM MILITARY CEMETERY, BRAY-SUR-SOMME
Son of T. W. and Ellen Styles, of 4, Carlton Terrace, Sydenham Park, London.
Private Edmund Petrzywalski
Royal Canadian Regiment
Date of death: 16/09/1916 (aged 26)
Cemetery: SERRE ROAD CEMETERY No.2
(Served as PETERS). Son of Jules and Mame Petrzywalski, of 75, Houston Rd., Forest Hill, London.