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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 Daniel Thomas
Date of death: 17/09/1914
Cemetery: VENDRESSE BRITISH CEMETERY
Private Gwilym Thomas
Date of death: 12/10/1915 (aged 17)
Cemetery: LES GONARDS CEMETERY, VERSAILLES
Son of John and Mary Ann Thomas, of Hebron House, Cross Hands, Llanelly.