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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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Able Seaman Mason
Royal Naval Volunteer Reserve, Nelson Bn. R.N. Div.
Date of death: 31/12/1917 (aged 24)
Cemetery: FLESQUIERES HILL BRITISH CEMETERY
Husband of Alice Mason, of 31, Prince Albert St., Bordesley Green, Birmingham.
Rifleman Harold Charles Mason
London Regiment (First Surrey Rifles)
Date of death: 31/12/1917 (aged 19)
Cemetery: ACHIET-LE-GRAND COMMUNAL CEMETERY EXTENSION
Son of Mr. C. Mason, of 97, Lilford Rd., Camberwell, London.