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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 Thomas Watson
Date of death: 27/03/1915
Cemetery: NEWCASTLE-UPON-TYNE (ST. JOHN'S WESTGATE AND ELSWICK) CEMETERY
See William Thomas MASON, the true family name.
Date of death: 12/08/1918 (aged 27)
Cemetery: AIRE COMMUNAL CEMETERY
See "BIRCH," the true family name.